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Income Taxes (Provision for Income Taxes) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current tax expense:        
Federal   $ (1,077) $ 1,744 $ 312
State   777 2,101 159
Foreign   8,036 9,421 7,111
Current income tax expense (benefit)   7,736 13,266 7,582
Deferred income tax expense (benefit)   2,063 (40,021) (2,871)
Provision (benefit) for income taxes   9,799 (26,755) $ 4,711
Tax Cuts and Jobs Act, Incomplete Accounting, Provisional Income Tax Expense (Benefit) $ (31,900)   $ (31,900)  
Tax Cuts and Jobs Act, Measurement Period Adjustment, Deferred Tax Revaluation, Income Tax Expense (Benefit)   1,300    
Tax Cuts and Jobs Act, Measurement Period Adjustment, Foreign Items, Income Tax Expense (Benefit)   (400)    
Tax Cuts and Jobs Act, Income Tax Expense (Benefit)   $ (31,000)