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Income Taxes (Income Before Continuing Operations) (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
Income from Continuing Operations before Income Taxes:                      
United States                 $ 84,435 $ 93,582 $ 142,253
Foreign                 22,651 17,268 14,932
Income before income taxes $ (52,562) $ 57,639 $ 49,321 $ 52,688 $ 18,802 $ 50,733 $ 50,228 $ (8,913) $ 107,086 $ 110,850 $ 157,185