Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income before taxes:
United States operations	$ 42,833	$ 115,500	$ 80,048
Foreign operations	109,577	114,580	17,940
Income from continuing operations before taxes	152,410	230,080	97,988
Currently payable
United States federal	21,893	31,730	(2,751)
United States state and local	3,090	3,912	336
Foreign	13,859	16,968	26,807
Income tax expense (benefit)	38,842	52,610	24,392
Deferred
United States federal	7,567	7,220	(17,741)
United States state and local	(1,205)	(31)	(7,115)
Foreign	(2,685)	3,137	(4,155)
Deferred Income tax expense (benefit)	3,677	10,326	(29,011)
Income tax expense (benefit)	$ 42,519	$ 62,936	$ (4,619)