Annual report pursuant to Section 13 and 15(d)

Property and Equipment (Details 2)

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Property and Equipment (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Depreciation and amortization expense for property and equipment      
Depreciation and amortization expense $ 5,910us-gaap_DepreciationAndAmortization $ 5,151us-gaap_DepreciationAndAmortization $ 4,685us-gaap_DepreciationAndAmortization