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Income Taxes (Components of Income Tax Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income (loss) before taxes:      
U.S. $ 10,088 $ (34,406) $ (55,617)
Foreign 55,069 52,586 48,404
Income (loss) before income taxes 65,157 18,180 (7,213)
Current income taxes:      
U.S. federal 1,156 1,383 49
U.S. state 246 127 126
Foreign 12,359 9,525 9,494
Total current income taxes 13,761 11,035 9,669
Deferred income taxes:      
U.S. federal 276 1,300 263
U.S. state 0 0 0
Foreign 683 (4,393) (651)
Total deferred income taxes 959 (3,093) (388)
Income tax expense $ 14,720 $ 7,942 $ 9,281