SUMMARIZED QUARTERLY FINANCIAL DATA (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 414,118,000	$ 386,141,000	$ 380,665,000	$ 309,005,000	$ 411,375,000	$ 378,508,000	$ 372,124,000	$ 300,560,000	$ 1,489,929,000	$ 1,462,567,000	$ 592,884,000
Operating income	(455,492,000)	79,490,000	64,762,000	30,383,000	(377,593,000)	78,733,000	27,552,000	5,689,000	(280,857,000)	(265,619,000)	12,584,000
Income (loss) available to the Company from continuing operations	(487,537,000)	38,208,000	25,992,000	3,125,000	(386,568,000)	36,590,000	1,597,000	(14,206,000)	(420,212,000)	(362,587,000)	233,013,000
Preferred stock dividend	0	0	0	0	0	0	0	0	0	0	2,015,000
Net income available to common shareholders from continuing operations	(487,537,000)	38,208,000	25,992,000	3,125,000	(386,568,000)	36,590,000	1,597,000	(14,206,000)	(420,212,000)	(362,587,000)	230,998,000
Income (loss) from discontinued operations, net of income taxes	0	0	0	0	(378,000)	358,000	844,000	328,000	0	1,152,000	836,000
Net income (loss) available to common shareholders	$ (487,537,000)	$ 38,208,000	$ 25,992,000	$ 3,125,000	$ (386,946,000)	$ 36,948,000	$ 2,441,000	$ (13,878,000)	$ (420,212,000)	$ (361,435,000)	$ 231,834,000
Net income (loss) from continuing operations per share - basic (in dollars per share)	$ (3.64)	$ 0.28	$ 0.19	$ 0.02	$ (2.80)	$ 0.26	$ 0.01	$ (0.10)	$ (3.07)	$ (2.63)	$ 4.49
Net income (loss) from discontinued operations, net of tax, per share - basic (in dollars per share)	0	0	0	0	0	0	0	0	0	0.01	0.02
Net income (loss) available to common shareholders per share - basic (in dollars per share)	$ (3.64)	$ 0.28	$ 0.19	$ 0.02	$ (2.80)	$ 0.27	$ 0.02	$ (0.10)	$ (3.07)	$ (2.62)	$ 4.51
Weighted average shares outstanding, basic (in shares)	133,985,000	136,449,000	138,760,000	138,099,000	138,033,000	138,740,000	138,639,000	138,939,000	136,967,455	138,069,608	51,392,899
Net income (loss) from continuing operations per share available to common shareholders - Diluted (in dollars per share)	$ (3.64)	$ 0.28	$ 0.19	$ 0.02	$ (2.80)	$ 0.26	$ 0.01	$ (0.10)	$ (3.07)	$ (2.63)	$ 4.37
Net income (loss) from discontinued operations per share available to common shareholders - Diluted (in dollars per share)	0	0	0	0	0	0	0	0	0	0.01	0.02
Net income (loss) per share available to common shareholders - Diluted (in dollars per share)	$ (3.64)	$ 0.28	$ 0.19	$ 0.02	$ (2.80)	$ 0.27	$ 0.02	$ (0.10)	$ (3.07)	$ (2.62)	$ 4.38
Weighted average common shares outstanding - diluted (in shares)	133,985,000	136,453,000	139,074,000	138,523,000	138,033,000	139,103,000	139,263,000	138,939,000	136,967,455	138,069,608	52,885,156
Preferred stock dividends declared and paid	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 2,574,000
Common stock dividends declared and paid	$ 2,679,000	$ 2,677,000	$ 12,487,000	$ 12,430,000	$ 12,367,000	$ 12,486,000	$ 12,475,000	$ 12,441,000