Consolidated Statements of Stockholders Equity and Other Comprehensive Income (Loss) - USD ($) $ in Thousands	Total	Public offering	2017 ATM Program	Common stock	Common stock Public offering	Common stock 2017 ATM Program	Treasury stock	Additional Paid-in Capital	Additional Paid-in Capital Public offering	Additional Paid-in Capital 2017 ATM Program	Accumulated Dividends	Accumulated Other Comprehensive Income (Loss)	Retained Earnings (Accumulated Deficit)
Beginning balance at Dec. 31, 2015	$ 2,745,386			$ 62			$ (7,373)	$ 4,838,444			$ (1,468,472)	$ (509,059)	$ (108,216)
Beginning Balance (in shares) at Dec. 31, 2015				62,134,894			(34,735)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	126,800												126,800
Other comprehensive loss	(440,083)											(440,083)
Issuance of common stock and release of treasury stock for employee equity awards	34,675			$ 1			$ 1,502	33,172
Issuance of common stock and release of treasury stock for employee equity awards (in shares)				847,374			7,099
Issuance of common stock for TelecityGroup acquisition	2,077,912			$ 7				2,077,905
Issuance of common stock for TelecityGroup acquisition (in shares)				6,853,500
Issuance of common stock, net and release of treasury stock for the exchanges and conversions of 4.75% convertible debt	150,025			$ 2			$ (141,688)	291,711
Issuance of common stock, net and release of treasury stock for the exchanges and conversions of 4.75% convertible debt (in shares)				1,981,662			(380,779)
Dividend distributions	(492,403)										(492,403)
Settlement of accrued dividends on vested equity awards	7,270							8,270			(1,000)
Accrued dividends on unvested equity awards	(7,770)										(7,770)
Tax benefit from employee stock plans	2,773							2,773
Stock-based compensation, net of estimated forfeitures	161,244							161,244
Ending balance at Dec. 31, 2016	4,365,829			$ 72			$ (147,559)	7,413,519			(1,969,645)	(949,142)	18,584
Ending Balance (in shares) at Dec. 31, 2016				71,817,430			(408,415)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	232,982												232,982
Other comprehensive loss	163,953											163,953
Issuance of common stock		$ 2,126,339	$ 355,082		$ 6				$ 2,126,333	$ 355,082
Issuance of common stock (in shares)			763,201		6,069,444	763,201
Issuance of common stock and release of treasury stock for employee equity awards	41,689			$ 1			$ 1,239	40,449
Issuance of common stock and release of treasury stock for employee equity awards (in shares)				790,329			6,073
Dividend distributions	(612,085)										(612,085)
Settlement of accrued dividends on vested equity awards	3,390							4,280			(890)
Accrued dividends on unvested equity awards	(10,172)										(10,172)
Stock-based compensation, net of estimated forfeitures	181,660							181,660
Ending balance at Dec. 31, 2017	$ 6,849,790			$ 79			$ (146,320)	10,121,323			(2,592,792)	(785,189)	252,689
Ending Balance (in shares) at Dec. 31, 2017	79,038,062			79,440,404			(402,342)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 62,894
Beginning balance at Dec. 31, 2017	$ 6,849,790			$ 79			$ (146,320)	10,121,323			(2,592,792)	(785,189)	252,689
Beginning Balance (in shares) at Dec. 31, 2017	79,038,062			79,440,404			(402,342)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 365,359												365,359
Other comprehensive loss	(158,389)											(158,389)
Issuance of common stock			$ 388,172			$ 1				$ 388,171
Issuance of common stock (in shares)			930,934			930,934
Issuance of common stock and release of treasury stock for employee equity awards	50,136			$ 1			$ 1,159	48,976
Issuance of common stock and release of treasury stock for employee equity awards (in shares)				747,779			5,483
Dividend distributions	(727,448)										(727,448)
Settlement of accrued dividends on vested equity awards	1,443							2,319			(876)
Accrued dividends on unvested equity awards	(10,084)										(10,084)
Stock-based compensation, net of estimated forfeitures	189,799							189,799
Noncontrolling interests	725							725
Ending balance at Dec. 31, 2018	$ 7,219,279			$ 81			$ (145,161)	$ 10,751,313			$ (3,331,200)	$ (945,702)	$ 889,948
Ending Balance (in shares) at Dec. 31, 2018	80,722,258			81,119,117			(396,859)