Income Taxes (Schedule of Components of Provision (Benefit) for Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current
Federal	$ 47,130	$ 92,453	$ 53,285
State	10,415	9,258	6,608
International	22,015	23,993	19,291
Provision for current income taxes	79,560	125,704	79,184
Deferred
Federal	3,970	(1,201)	20,305
State	(937)	(4,102)	1,196
International	(1,898)	(2,613)	(893)
Provision (benefit) for deferred income taxes	1,135	(7,916)	20,608
Provision for income taxes	$ 80,695	$ 117,788	$ 99,792