Annual report pursuant to Section 13 and 15(d)

Property and Equipment (Narrative) (Details)

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Property and Equipment (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property and Equipment [Abstract]      
Depreciation, Depletion and Amortization $ 14,110 $ 14,272 $ 14,862
Depreciation and amortization expense $ 9,600 $ 9,500 $ 9,200