Income Taxes (Components of Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current Income Tax Expense (Benefit) [Abstract]
Federal	$ 22,353	$ 2,390	$ 1,259
State	847	1,153	310
Foreign	15,212	8,266	3,266
Current income tax provision	38,412	11,809	4,835
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal	5,617	(5,558)	78
State	(1,031)	(976)	295
Foreign	(10,497)	(4,498)	(3,571)
Deferred income tax provision	(5,911)	(11,032)	(3,198)
Total provision for income taxes	$ 32,501	$ 777	$ 1,637