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Income Taxes (Income Before Continuing Operations) (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
Income from Continuing Operations before Income Taxes:                      
United States                 $ 93,582 $ 142,253 $ 122,588
Foreign                 17,268 14,932 4,870
Income before income taxes $ 18,802 $ 50,733 $ 50,228 $ (8,913) $ 24,603 $ 43,181 $ 49,231 $ 40,170 $ 110,850 $ 157,185 $ 127,458