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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share [Abstract]                      
Net Income (Loss) Attributable to Parent $ 145,232 $ 192,201 $ 220,548 $ 211,015 $ 148,839 $ 230,322 $ 205,915 $ 216,653 $ 768,996 $ 801,729 $ 797,036
Distributed Earnings Available To Participating Securities                 (2,823) (3,154) (3,304)
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic                 4,735 6,370 8,348
Net Income (Loss) Available to Common Stockholders, Basic                 761,438 792,205 785,384
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted                 (4,735) (6,370) (8,348)
Undistributed Earnings Reallocated To Participating Securities                 (4,692) (6,290) (8,218)
Net Income (Loss) Available to Common Stockholders, Diluted                 $ 761,481 $ 792,285 $ 785,514
Weighted Average Number of Shares Outstanding, Basic                 65,156,864 68,334,322 69,455,507
Incremental Common Shares Attributable to Participating Nonvested Shares with Non-forfeitable Dividend Rights                 608,257 871,422 1,120,925
Weighted Average Number of Shares Outstanding, Diluted                 65,765,121 69,205,744 70,576,432
Basic (in dollars per share) $ 2.32 $ 2.94 $ 3.28 $ 3.11 $ 2.17 $ 3.33 $ 2.97 $ 3.11 $ 11.69 $ 11.59 $ 11.31
Diluted (in dollars per share) $ 2.30 $ 2.92 $ 3.25 $ 3.07 $ 2.14 $ 3.30 $ 2.94 $ 3.07 $ 11.58 $ 11.45 $ 11.13