Income Taxes Income Tax by Jurisdiction (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest
Income (Loss) from Continuing Operations before Income Taxes, Domestic	$ 50,760	$ (69,850)	$ (3,150)
Income (Loss) from Continuing Operations before Income Taxes, Foreign	15,450	11,620	(18,970)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	66,210	(58,230)	(22,120)
Current Federal Tax Expense (Benefit)	12,800	7,560	12,150
Current State and Local Tax Expense (Benefit)	1,770	1,920	1,080
Current Foreign Tax Expense (Benefit)	5,420	4,250	2,060
Current Income Tax Expense (Benefit)	19,990	13,730	15,290
Deferred Federal Income Tax Expense (Benefit)	15,180	(28,180)	(1,980)
Deferred State and Local Income Tax Expense (Benefit)	1,280	(2,550)	(1,530)
Deferred Foreign Income Tax Expense (Benefit)	(1,200)	(1,430)	(5,240)
Deferred Income Tax Expense (Benefit)	15,260	(32,160)	(8,750)
Income Tax Expense (Benefit), Continuing Operations	$ 35,250	$ (18,430)	$ 6,540