Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income (loss) before taxes:
United States operations	$ 126,385	$ 2,177	$ (25,615)
Foreign operations	93,945	97,171	152,076
Income before taxes	220,330	99,348	126,461
Currently payable
United States federal	27,529	0	2,981
United States state and local	3,274	2,392	(1,038)
Foreign	17,516	28,201	26,906
Income tax expense (benefit)	48,319	30,593	28,849
Deferred
United States federal	10,942	(11,028)	(27,677)
United States state and local	703	(8,758)	(3,139)
Foreign	(345)	(4,312)	782
Deferred Income tax expense (benefit)	11,300	(24,098)	(30,034)
Income tax expense (benefit)	$ 59,619	$ 6,495	$ (1,185)