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Income Taxes (Components of Provision for Income Taxes) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Current                      
Federal                 $ 6,080 $ 13,066 $ 7,801
State                 1,171 760 625
Foreign                 3,905 3,228 1,675
Deferred                      
Federal                 44,787 31,012 27,045
State                 1,678 1,162 (7,879)
Foreign                 (343) (30) (134)
Total provision for income taxes $ 10,667 $ 15,186 $ 17,428 $ 13,997 $ 13,677 $ 12,241 $ 11,862 $ 11,418 $ 57,278 $ 49,198 $ 29,133