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Property, Plant and Equipment (Details Textual) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]      
Depreciation, Depletion and Amortization, Nonproduction $ 13,639us-gaap_DepreciationAndAmortization $ 11,400us-gaap_DepreciationAndAmortization $ 10,791us-gaap_DepreciationAndAmortization