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Income Taxes Income taxes (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 22, 2017
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Holiday [Line Items]          
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount $ 0.21        
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability     $ 7,599,000    
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount     9,914,000    
Deferred Foreign Income Tax Expense (Benefit)     21,994,000    
Provision for income taxes     2,315,000    
Deferred Tax Liabilities, Undistributed Foreign Earnings   $ (2,422,000) (2,422,000) $ (31,262,000)  
Undistributed Earnings of Foreign Subsidiaries   310,134,000 310,134,000    
Deferred Income Tax Expense (Benefit)   $ 31,908,000 $ (20,166,000) $ (7,262,000) $ 15,877,000