Quarterly report pursuant to Section 13 or 15(d)

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

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Intangible Assets, Net and Goodwill (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]          
Amortization of Intangible Assets $ 745,000 $ 1,106,000 $ 1,490,000 $ 2,393,000  
Goodwill $ 68,594,000 $ 68,594,000 $ 68,594,000 $ 68,594,000 $ 68,594,000
Minimum [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Asset, Useful Life     3 years