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Income Taxes (Income Before Continuing Operations) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Income from Continuing Operations before Income Taxes:                      
United States                 $ (52,313) $ 84,435 $ 93,582
Foreign                 14,258 22,651 17,268
(Loss) income before income taxes $ (179,030) $ 50,996 $ 43,519 $ 46,460 $ (52,562) $ 57,639 $ 49,321 $ 52,688 $ (38,055) $ 107,086 $ 110,850