Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets (Details)

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Goodwill and Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Changes in the carrying amount of the Company's goodwill    
Balance at the beginning of the period $ 65,644  
WMS acquisition 8,691  
Balance at the end of the period 74,335  
Components of goodwill and intangible assets    
Gross Carrying Amount 53,773 36,773
Accumulated Amortization (15,425) (9,623)
Net Carrying Amount 38,348 27,150
Customer lists
    
Components of goodwill and intangible assets    
Gross Carrying Amount 42,103 28,103
Accumulated Amortization (12,858) (8,720)
Net Carrying Amount 29,245 19,383
Customer lists | Minimum
    
Components of goodwill and intangible assets    
Useful Life 4 years  
Customer lists | Maximum
    
Components of goodwill and intangible assets    
Useful Life 12 years  
Proprietary technology
    
Components of goodwill and intangible assets    
Gross Carrying Amount 9,580 6,580
Accumulated Amortization (1,987) (657)
Net Carrying Amount 7,593 5,923
Proprietary technology | Minimum
    
Components of goodwill and intangible assets    
Useful Life 1 year 6 months  
Proprietary technology | Maximum
    
Components of goodwill and intangible assets    
Useful Life 8 years  
Trade names
    
Components of goodwill and intangible assets    
Useful Life 5 years  
Gross Carrying Amount 2,090 2,090
Accumulated Amortization (580) (246)
Net Carrying Amount $ 1,510 $ 1,844