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Income Taxes (Components of Provision for Income Taxes) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Current                      
Federal                 $ 31,327 $ 40,183 $ 6,080
State                 2,686 2,808 1,171
Foreign                 5,588 4,242 3,905
Deferred                      
Federal                 (270,796) (5,421) 44,787
State                 (1,240) (163) 1,678
Foreign                 (49) (194) (343)
Total (benefit) provision for income taxes $ (12,875) $ (257,154) $ 18,616 $ 18,929 $ 7,712 $ 19,092 $ 18,033 $ (3,382) $ (232,484) $ 41,455 $ 57,278