Income Taxes Income Taxes - Income Tax Provision for Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal	$ 23,254	$ 9,969	$ 58,816
State	2,983	(794)	1,173
Foreign	29,532	15,690	10,364
Total current income tax expense	55,769	24,865	70,353
Federal	(10,447)	16,563	(22,951)
State	(2,169)	784	25
Foreign	3,599	9,837	(9,222)
Total deferred income tax expense	(9,017)	27,184	(32,148)
Provision for income taxes	$ 46,752	$ 52,049	$ 38,205