CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS’ EQUITY - USD ($)	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2018		766,881,000
Beginning balance at Dec. 31, 2018	$ 4,224,805,000	$ 7,669,000	$ 5,969,347,000	$ (1,680,432,000)	$ (71,779,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive loss, net of tax	(7,866,000)				(7,866,000)
Net loss	(66,470,000)			(66,470,000)
Stock Issued During Period, Shares, Dividend Reinvestment Plan		3,407,000
Dividends	$ (4,284,000)			26,725,000
Stock Issued During Period, Value, Dividend Reinvestment Plan		$ 34,000	22,407,000
Share-based compensation expense (in shares)		0
Stock Repurchased and Retired During Period, Shares	(3,000,000)	(3,273,000)
Stock Repurchased and Retired During Period, Value	$ (21,854,000)	$ (33,000)	(21,821,000)	0
Share-based compensation expense	23,710,000		23,710,000
Other (in shares)		10,000
Other	(10,000)	$ 0	25,000	(35,000)
Stock Issued During Period, Shares, New Issues		0
Stock Issued During Period, Value, New Issues	0	$ 0	0
Ending balance (in shares) at Mar. 31, 2019		767,005,000
Ending balance at Mar. 31, 2019	4,148,031,000	$ 7,670,000	5,993,668,000	(1,773,662,000)	(79,645,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 0			0
Beginning balance (in shares) at Dec. 31, 2019	753,622,044	753,622,000
Beginning balance at Dec. 31, 2019	$ 3,184,369,000	$ 7,536,000	5,977,402,000	(2,742,193,000)	(58,376,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive loss, net of tax	(96,056,000)				(96,056,000)
Net loss	(300,293,000)			(300,293,000)
Stock Issued During Period, Shares, Dividend Reinvestment Plan		0
Dividends	(27,114,000)			27,117,000
Stock Issued During Period, Value, Dividend Reinvestment Plan		$ 0	3,000
Share-based compensation expense (in shares)		0
Stock Repurchased and Retired During Period, Shares		0
Stock Repurchased and Retired During Period, Value	0	$ 0	0	0
Share-based compensation expense	23,499,000		23,499,000
Other (in shares)		(247,000)
Other	(1,263,000)	$ 2,000	(173,000)	(1,092,000)
Stock Issued During Period, Shares, New Issues		16,279,000
Stock Issued During Period, Value, New Issues	$ 113,841,000	$ 163,000	113,678,000
Ending balance (in shares) at Mar. 31, 2020	770,147,804	770,148,000
Ending balance at Mar. 31, 2020	$ 2,894,826,000	$ 7,701,000	$ 6,114,409,000	$ (3,072,852,000)	$ (154,432,000)