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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income before income taxes:                      
Domestic                 $ 30,464 $ 32,907 $ 36,657
Foreign                 37,929 32,151 15,925
Income before income taxes                 68,393 65,058 52,582
Provision for income taxes:                      
Federal                 (4,384) 2,370 2,478
State and foreign                 6,900 6,288 11,014
Total current expense (benefit)                 2,516 8,658 13,492
Deferred:                      
Federal                 6,780 3,788 (2,585)
State and foreign                 (1,194) (1,236) (3,374)
Total deferred benefit                 5,586 2,552 (5,959)
Income Tax Expense (Benefit), Total $ (4,249) $ 1,450 $ 9,066 $ 1,835 $ 690 $ 3,467 $ 3,820 $ 3,233 $ 8,102 $ 11,210 $ 7,533