Income Taxes Income Tax Expense Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%	35.00%	35.00%
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate	$ (20,380)	$ (7,740)	$ 24,360
Income Tax Reconciliation, State and Local Income Taxes	(550)	(520)	2,520
Income Tax Reconciliation, Foreign Income Tax Rate Differential	(1,930)	110	(200)
Income Tax Reconciliation, Tax Contingencies	(1,410)	(460)	(2,490)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount	5,050	11,430	0
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount	(310)	(980)	0
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	(830)	(1,680)	(1,920)
Income Tax Reconciliation, Tax on Undistributed Foreign Earnings	340	610	50
Income Tax Reconciliation, Change in Deferred Tax Assets Valuation Allowance	2,140	3,770	3,270
Income Tax Reconciliation, Other Adjustments	(550)	2,000	(2,880)
Income Tax Expense (Benefit), Continuing Operations	$ (18,430)	$ 6,540	$ 22,710