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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets related to non-vested stock awards	$ 1,530
Interest expense related to uncertain tax positions	536	$ 364	$ 430
Interest on Income Taxes Accrued	1,329	794
Lapsing of statutes of limitations	$ 328	$ 0	$ 0
Statutory U.S. federal income tax rate	21.00%	35.00%	35.00%
Income tax expense/(benefit) from tax rate change	$ 6,446
One-time transition tax	0
Foreign Tax Authority [Member]
Gross NOLS	54,599	$ 50,292
Valuation allowances of deferred tax assets	63,509	$ 54,675
Domestic Tax Authority [Member]
Lapsing of statutes of limitations	$ 767

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