Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Impact of federal tax law change		$ 53,348
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		35.00%	35.00%	35.00%
One-time transition tax liability for foreign subsidiaries		$ 500
Net increase (decrease) in unrecognized tax benefit		(1,100)	$ 4,000	$ (4,000)
Gross unrecognized tax benefits		$ 6,495	$ 7,574	$ 3,612	$ 7,636
Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%