Income Taxes (Deferred Income Taxes Classified In Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Tax Credit Carryforward [Line Items]
Net non-current deferred income tax asset	$ 4,824	$ 36,799
Net non-current deferred income tax liability	(13,657)	(10,424)
Deferred income tax asset, net	(8,833)	26,375
Net non-current deferred income tax asset	8,833	(26,375)
Domestic [Member]
Tax Credit Carryforward [Line Items]
Net non-current deferred income tax asset	4,315	(32,099)
Foreign [Member]
Tax Credit Carryforward [Line Items]
Net non-current deferred income tax asset	$ (4,518)	$ (5,724)