Income Taxes (Deferred Income Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Non-current deferred tax assets:
Share-based compensation expense	$ 2,051	$ 2,940
Accruals, reserves, and other expenses	18,734	20,728
Net operating loss	37,727	42,956
Intangible assets	1,363	1,620
Future uncertain tax position offset	654	498
Unrealized loss on foreign currency	0	119
Foreign tax credit	66,321	67,655
Other	2,957	2,792
Valuation allowance	(113,237)	(119,494)
Total non-current deferred tax assets	16,570	19,814
Non-current deferred tax liabilities:
Intangible assets	(164)	0
Property and equipment	(7,332)	(9,640)
Deferred Tax Liabilities, Other	411	0
Total non-current deferred tax liabilities	$ 7,907	$ 9,640