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Net Deferred Tax Assets (Liabilities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure Net Deferred Tax Assets Liabilities [Abstract]    
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 700 $ 600
Non-current deferred tax assets 6,863 2,910
Non-current deferred tax liabilities 118,528 152,172
Non-current deferred tax liabilities (111,665) (149,262)
Deferred Tax Liabilities, Net $ (111,665) $ (149,262)