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Income Taxes (Components of Provision for Income Taxes) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Current                      
Federal                 $ 40,183 $ 6,080 $ 13,066
State                 2,808 1,171 760
Foreign                 4,242 3,905 3,228
Deferred                      
Federal                 (5,421) 44,787 31,012
State                 (163) 1,678 1,162
Foreign                 (194) (343) (30)
Total provision for income taxes $ 7,712 $ 19,092 $ 18,033 $ (3,382) $ 10,667 $ 15,186 $ 17,428 $ 13,997 $ 41,455 $ 57,278 $ 49,198