CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Paid-in Capital	Accumulated Other Comprehensive (Loss) Income	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2018		162,986
Beginning balance at Dec. 31, 2018	$ 3,327,768	$ 1,630	$ 4,227,532	$ (56,026)	$ (845,368)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	62,242				62,242
Other Comprehensive Income (Loss)	3,801			3,801
Stock Compensation	2,785		2,785
Shares Repurchased (in shares)		(3,619)
Shares Repurchased	(28,330)	$ (37)	(28,293)
Issuance of Restricted Stock (in shares)		55
Issuance of Restricted Stock	0	$ 1	(1)
Ending balance (in shares) at Mar. 31, 2019		159,422
Ending balance at Mar. 31, 2019	3,368,266	$ 1,594	4,202,023	(52,225)	(783,126)
Beginning balance (in shares) at Dec. 31, 2018		162,986
Beginning balance at Dec. 31, 2018	3,327,768	$ 1,630	4,227,532	(56,026)	(845,368)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	297,198
Other Comprehensive Income (Loss)	7,411
Ending balance (in shares) at Jun. 30, 2019		159,396
Ending balance at Jun. 30, 2019	3,607,408	$ 1,594	4,202,599	(48,615)	(548,170)
Beginning balance (in shares) at Mar. 31, 2019		159,422
Beginning balance at Mar. 31, 2019	3,368,266	$ 1,594	4,202,023	(52,225)	(783,126)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	234,956				234,956
Other Comprehensive Income (Loss)	3,610			3,610
Stock Compensation	2,846		2,846
Shares Repurchased (in shares)		(297)
Shares Repurchased	(2,270)	$ (3)	(2,267)
Issuance of Restricted Stock (in shares)		271
Issuance of Restricted Stock	0	$ 3	(3)
Ending balance (in shares) at Jun. 30, 2019		159,396
Ending balance at Jun. 30, 2019	$ 3,607,408	$ 1,594	4,202,599	(48,615)	(548,170)
Beginning balance (in shares) at Dec. 31, 2019	159,700	159,711
Beginning balance at Dec. 31, 2019	$ 1,314,592	$ 1,597	4,207,554	(46,833)	(2,847,726)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(517,538)				(517,538)
Other Comprehensive Income (Loss)	(15,030)			(15,030)
Stock Compensation	2,104		2,104
Shares Repurchased (in shares)		(80)
Shares Repurchased	(79)	$ (1)	(78)
Issuance of Restricted Stock (in shares)		211
Issuance of Restricted Stock	0	$ 2	(2)
Ending balance (in shares) at Mar. 31, 2020		159,842
Ending balance at Mar. 31, 2020	$ 784,049	$ 1,598	4,209,578	(61,863)	(3,365,264)
Beginning balance (in shares) at Dec. 31, 2019	159,700	159,711
Beginning balance at Dec. 31, 2019	$ 1,314,592	$ 1,597	4,207,554	(46,833)	(2,847,726)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(1,078,606)
Other Comprehensive Income (Loss)	$ (8,158)
Ending balance (in shares) at Jun. 30, 2020	160,100	160,116
Ending balance at Jun. 30, 2020	$ 231,340	$ 1,601	4,211,062	(54,991)	(3,926,332)
Beginning balance (in shares) at Mar. 31, 2020		159,842
Beginning balance at Mar. 31, 2020	784,049	$ 1,598	4,209,578	(61,863)	(3,365,264)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(561,068)				(561,068)
Other Comprehensive Income (Loss)	6,872			6,872
Stock Compensation	1,515		1,515
Shares Repurchased (in shares)		(27)
Shares Repurchased	(28)		(28)
Issuance of Restricted Stock (in shares)		301
Issuance of Restricted Stock	$ 0	$ 3	(3)
Ending balance (in shares) at Jun. 30, 2020	160,100	160,116
Ending balance at Jun. 30, 2020	$ 231,340	$ 1,601	$ 4,211,062	$ (54,991)	$ (3,926,332)