Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income (loss) before taxes:
United States operations	$ (117,819)	$ 42,833	$ 115,500
Foreign operations	183,946	109,577	114,580
Income from continuing operations before taxes	66,127	152,410	230,080
Currently payable
United States federal	273	21,893	31,730
United States state and local	91	3,090	3,912
Foreign	11,511	13,859	16,968
Income tax expense (benefit)	11,875	38,842	52,610
Deferred
United States federal	(1,754)	7,567	7,220
United States state and local	(2,310)	(1,205)	(31)
Foreign	3,913	(2,685)	3,137
Deferred Income tax expense (benefit)	(151)	3,677	10,326
Income tax expense	$ 11,724	$ 42,519	$ 62,936