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EARNINGS PER SHARE ("EPS") (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Computation of Basic earnings per share:                      
Net income $ 122,722 $ 163,642 $ 71,815 $ 46,280 $ 56,829 $ 179,948 $ 25,367 $ 71,693 $ 404,459 $ 333,837 [1] $ 173,533 [1]
Less: net income allocated to participating securities                 0 0 (159)
Net (loss) income for basic (loss) earnings per share calculation                 $ 404,459 $ 333,837 $ 173,374
Total weighted average shares outstanding - basic (in shares)                 113,096 113,176 110,210
Less: weighted average participating shares outstanding (in shares)                 0 0 (101)
Weighted average common shares outstanding - basic (in shares)                 113,096 113,176 110,109
Basic earnings per share (in dollars per share) $ 1.08 $ 1.44 $ 0.63 $ 0.41 $ 0.50 $ 1.59 $ 0.22 $ 0.63 $ 3.58 $ 2.95 $ 1.57
Computation of Diluted earnings per share:                      
Net income $ 122,722 $ 163,642 $ 71,815 $ 46,280 $ 56,829 $ 179,948 $ 25,367 $ 71,693 $ 404,459 $ 333,837 [1] $ 173,533 [1]
Less: net income allocated to participating securities                 0 0 (155)
Net income for diluted earnings per share calculation                           $ 404,459 $ 333,837 $ 173,378
Weighted average common shares outstanding - basic (in shares)                 113,096 113,176 110,109
Add: dilutive effect of common stock equivalents (in shares)                 1,040 2,022 2,755
Weighted average common shares outstanding—diluted (in shares)                 114,136 115,198 112,864
Less: weighted average participating shares outstanding (in shares)                 0 0 (101)
Weighted average common shares outstanding - diluted (in shares)                 114,136 115,198 112,763
Diluted earnings (loss) per share (in dollars per share) $ 1.07 $ 1.43 $ 0.63 $ 0.41 $ 0.50 $ 1.57 $ 0.22 $ 0.62 $ 3.54 $ 2.90 $ 1.54
[1] Prior period amounts have been adjusted retrospectively to reflect the adoption of ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. Refer to Note 1 for further discussion.