CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In- Capital	Treasury Stock	Accumulated Deficit	Noncontrolling Interest	Cumulative Effect Period Of Adoption Adjustment Accumulated Deficit
Balances at beginning of period at Dec. 31, 2018	$ 1,018,413	$ 1,968	$ 4,151,147	$ (64,940)	$ (3,069,272)	$ (490)	$ (55,885)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(42,606)				(42,595)	(11)
Compensation expense related to restricted stock grants			6,356
Issuance of common stock under Associate Stock Purchase Plan		1	298
Restricted stock, net		35	(35)
Shares withheld for employee taxes		(4)	(2,993)
Purchase of treasury stock				(6,000)
Other, net			17
Balances at end of period at Mar. 31, 2019	917,597	$ 2,000	4,154,790	(70,940)	(3,167,752)	(501)
Balances at beginning of period (in shares) at Dec. 31, 2018		192,356,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under Associate Stock Purchase Plan (in shares)		50,000
Restricted stock grants, net (in shares)		3,534,000
Shares withheld for employee taxes (in shares)		(434,000)
Purchase of treasury stock (in shares)		(933,000)
Balances at end of period (in shares) at Mar. 31, 2019		194,573,000
Balances at beginning of period at Dec. 31, 2019	698,725	$ 1,996	4,172,099	(84,651)	(3,393,088)	2,369	$ (115)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	369,497				369,515	(18)
Compensation expense related to restricted stock grants			5,957
Issuance of common stock under Associate Stock Purchase Plan		1	168
Restricted stock, net		(6)	6
Shares withheld for employee taxes		(6)	(3,892)
Purchase of treasury stock				(18,123)
Other, net			18
Balances at end of period at Mar. 31, 2020	$ 1,052,230	$ 1,985	$ 4,174,356	$ (102,774)	$ (3,023,688)	$ 2,351
Balances at beginning of period (in shares) at Dec. 31, 2019	192,128,586	192,129,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under Associate Stock Purchase Plan (in shares)		61,000
Restricted stock grants, net (in shares)		(504,000)
Shares withheld for employee taxes (in shares)		(611,000)
Purchase of treasury stock (in shares)		(3,063,000)
Balances at end of period (in shares) at Mar. 31, 2020	188,012,169	188,012,000