Annual report pursuant to Section 13 and 15(d)

Intangible Assets, Net and Goodwill (Narrative) (Details)

v3.6.0.2
Intangible Assets, Net and Goodwill (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]      
Amortization expense $ 5,146,000 $ 5,146,000,000 $ 7,057,000
Estimated amortization expense, 2015 3,883,000    
Estimated amortization expense, 2016 2,980,000    
Estimated amortization expense, 2017 2,980,000    
Estimated amortization expense, 2018 2,537,000    
Estimated amortization expense, 2019 1,650,000    
Impairment of goodwill 0 0 0
Impairment of intangible assets (excluding goodwill) $ 0 $ 0 $ 0
Minimum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Amortization period, in years 3 years    
Maximum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Amortization period, in years 10 years    
Order Backlog [Member]      
Finite-Lived Intangible Assets [Line Items]      
Amortization period, in years 1 year