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Income Taxes (Components of Provision for Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current provision:
State	$ 5,764	$ 5,513	$ 1,535
Foreign	13,756	11,681	8,121
Total current	19,520	17,194	9,656
Deferred provision (benefit) for taxes:
Federal	(9,463)	18,736	170,177
State	(1,412)	(241)	22,992
Foreign	(16,673)	9,155	30,425
Change in valuation allowance	12,261	(31,607)	(222,185)
Total deferred	(15,287)	(3,957)	1,409
Total provision for income taxes	$ 4,233	$ 13,237	$ 11,065

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