SUPPLEMENTAL INFORMATION - QUARTERLY FINANCIAL INFORMATION Quarterly Income Statement Information (Details) - USD ($) $ / shares in Units, $ in Thousands	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
Revenues	$ 265,022	$ 365,943	$ 390,658	$ 134,500	$ 794,811	$ 280,717	$ 212,531	$ 260,600	$ 1,156,123	$ 1,548,659	$ 921,616
Total cost, expenses and other	267,713	321,562	280,623	275,120	538,626	270,593	400,770	260,924	1,145,018	1,470,913	1,159,868
Operating Income (Loss)	(2,691)	44,381	110,035	(140,620)	256,185	10,124	(188,239)	(324)	11,105	77,746	(238,252)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	(20,111)	26,570	91,135	(157,588)	238,024	(7,310)	(205,580)	(17,705)	(59,994)	7,429	(339,432)
Net income (loss)	$ (20,952)	$ 15,908	$ 68,548	$ (120,176)	$ 178,853	$ (3,434)	$ (160,257)	$ (13,139)	$ (56,672)	$ 2,023	$ (127,504)
Basic	$ (0.34)	$ 0.25	$ 1.04	$ (1.82)	$ 2.71	$ (0.05)	$ (2.43)	$ (0.20)	$ (0.89)	$ 0.03	$ (1.94)
Diluted	$ (0.34)	$ 0.25	$ 1.04	$ (1.82)	$ 2.71	$ (0.05)	$ (2.43)	$ (0.20)	$ (0.89)	$ 0.03	$ (1.94)