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Income Taxes (Schedule of Components of Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income before income taxes:                      
Domestic                 $ 32,907 $ 36,657 $ 35,088
Foreign                 32,151 15,925 4,097
Income before income taxes                 65,058 52,582 39,185
Provision for income taxes:                      
Federal                 2,370 2,478 760
State and foreign                 6,288 11,014 2,575
Total current expense (benefit)                 8,658 13,492 3,335
Deferred:                      
Federal                 3,788 (2,585) (37,828)
State and foreign                 (1,236) (3,374) (1,896)
Total deferred benefit                 2,552 (5,959) (39,724)
Income Tax Expense (Benefit), Total $ 690 $ 3,467 $ 3,820 $ 3,233 $ (6,036) $ 3,809 $ 5,189 $ 4,571 $ 11,210 $ 7,533 $ (36,389)