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Income Taxes (Income Before Continuing Operations) (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
Income from Continuing Operations before Income Taxes:                      
United States                 $ 142,253 $ 122,588 $ 98,786
Foreign                 14,932 4,870 2,962
Income before income taxes $ 24,603 $ 43,181 $ 49,231 $ 40,170 $ 37,449 $ 33,534 $ 28,325 $ 28,150 $ 157,185 $ 127,458 $ 101,748