Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income from continuing operations before income taxes:
U.S.	$ 3,082	$ 34,129	$ 11,525
International	192,617	148,492	146,421
Income before income taxes	195,699	182,621	157,946
Current:
U.S. – federal	77,799	7,215	(210)
U.S. – state	1,762	755	2,019
International	48,032	41,516	32,217
Current Income Tax Expense (Benefit)	127,593	49,486	34,026
Deferred:
U.S. – federal	9,596	6,091	7,670
U.S. – state	819	1,060	(1,137)
International	(1,724)	(9,617)	(3,993)
Deferred Income Tax Expense (Benefit)	8,691	(2,466)	2,540
Income taxes	$ 136,284	$ 47,020	$ 36,566