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 and equity income
U.S.	$ 5,694	$ (99,939)	$ 16,169
International	89,757	20,468	18,646
Income (loss) from continuing operations before income taxes and equity income	95,451	(79,471)	34,815
Currently payable:
U.S. federal	4,107	(4,088)	408
U.S. state	372	365	546
International	21,975	18,014	23,095
Total income taxes currently payable	26,454	14,291	24,049
Deferred U.S. federal	46,470	(8,195)	2,651
Deferred U.S. state	1,142	2,238	812
Deferred international	9,737	(1,697)	166
Total income tax expense	83,803	6,637	27,678
Cash payments for income taxes, including taxes on gain or loss from discontinued business	$ 24,900	$ 14,600	$ 18,900