Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets (Details)

v2.4.1.9
Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Components of intangible assets      
Gross Carrying Amount $ 90,364us-gaap_FiniteLivedIntangibleAssetsGross   $ 87,371us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization (31,850)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization   (28,717)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net Carrying Amount 58,514us-gaap_IntangibleAssetsNetExcludingGoodwill   58,654us-gaap_IntangibleAssetsNetExcludingGoodwill
Amortization expense 3,133us-gaap_AmortizationOfIntangibleAssets 2,444us-gaap_AmortizationOfIntangibleAssets  
Customer lists      
Components of intangible assets      
Gross Carrying Amount 68,603us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
  68,603us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
Accumulated Amortization (24,015)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
  (21,699)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
Net Carrying Amount 44,588us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
  46,904us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
Customer lists | Minimum      
Components of intangible assets      
Useful Life 4 years    
Customer lists | Maximum      
Components of intangible assets      
Useful Life 12 years    
Proprietary technology      
Components of intangible assets      
Gross Carrying Amount 18,671us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
  15,678us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Accumulated Amortization (6,458)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
  (5,808)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Net Carrying Amount 12,213us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
  9,870us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Proprietary technology | Minimum      
Components of intangible assets      
Useful Life 1 year 6 months    
Proprietary technology | Maximum      
Components of intangible assets      
Useful Life 8 years    
Trade names      
Components of intangible assets      
Useful Life 5 years    
Gross Carrying Amount 3,090us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
  3,090us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
Accumulated Amortization (1,377)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
  (1,210)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
Net Carrying Amount $ 1,713us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
  $ 1,880us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember