Consolidated Statement Of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income	Noncontrolling Interests	Stockholders' Equity, Total [Member]	Total Equity [Member]	AOCI Including Portion Attributable to Noncontrolling Interest [Member]	Series A Preferred Stock	Common OP Units [Member]	Series A-4 Preferred Stock [Member]	Series A-4 Preferred Stock [Member] Additional Paid-in Capital	Series A-4 Preferred Stock [Member] Stockholders' Equity, Total [Member]	Series A-4 Preferred Stock [Member] Total Equity [Member]	Series A-4 Preferred Op Units [Member] Additional Paid-in Capital	Series A-4 Preferred Op Units [Member] Stockholders' Equity, Total [Member]	Series A-4 Preferred Op Units [Member] Total Equity [Member]	Series D Preferred OP Units [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests	$ 66,944
Balance at Dec. 31, 2016		$ 732	$ 3,321,441	$ (1,023,415)		$ 66,616	$ 2,362,227	$ 2,429,171	$ (3,181)	$ 34
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, Conversion of Convertible Securities		1	3,556			(3,298)	259	0
Issuance of common stock from exercise of options, net			514,024				516,088	516,088
Net proceeds (in millions)	29,700	63				2,001
Conversion of Series A-4 preferred stock	4,720	1	4,719				4,720	0
Temporary Equity, Accretion to Redemption Value	(5,166)											$ (13,093)
Adjustments to Additional Paid in Capital, Redemption of Stock													$ 3,867	$ 3,867	$ 16,960	$ 2,571	$ 2,571	$ 7,737
Reclassifications of Temporary to Permanent Equity											$ (259)	(4,720)
Stock Redeemed or Called During Period, Value			(84,966)				(85,000)	(85,000)		(34)
Share-based compensation - amortization and forfeitures			12,398	297			12,695	12,695
Net Income	81,819			76,765		4,849	81,614	81,819
Temporary Equity, Dividends	(845)
Unrealized gain on interest rate swaps						244	4,527	4,527	4,283
Temporary Equity, Net Income	205
Distributions				215,648		11,257	226,905	227,750
Settlement of membership interest			6,201			(6,101)	100	100
Balance at Dec. 31, 2017		797	3,758,533	(1,162,001)		65,256	2,663,687	2,706,753	1,102	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests	43,066
Stock Issued During Period, Value, Conversion of Convertible Securities		1	1,514			(1,173)	342	0
Issuance of common stock from exercise of options, net			623,474				623,540	623,540
Net proceeds (in millions)		66				0
Conversion of Series A-4 preferred stock	675	0	675				675	0
Reclassifications of Temporary to Permanent Equity											(342)	(675)
Share-based compensation - amortization and forfeitures			14,753	313			15,066	15,066
Temporary Equity, Acquisition Of Equity Interests	21,976							21,976
Net Income	120,158			111,715		8,202	119,917	120,158
Temporary Equity, Dividends	(674)
Unrealized gain on interest rate swaps						(272)	(5,878)	(5,878)	(5,606)
Temporary Equity, Net Income	241
Distributions				238,513		11,514	250,027	250,701
Balance at Dec. 31, 2018	3,167,322	864	4,398,949		$ (1,288,486)	60,499	3,167,322	3,230,914	(4,504)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests	63,592
Stock Issued During Period, Value, Conversion of Convertible Securities		5	11,305			(1,658)	9,652	0
Issuance of common stock from exercise of options, net			754,116				754,174	754,174
Net proceeds (in millions)		58				0
Conversion of Series A-4 preferred stock	31,739	5	31,734				31,739	0
Reclassifications of Temporary to Permanent Equity											$ (9,652)	$ (31,739)
Share-based compensation - amortization and forfeitures			17,160	322			17,482	17,482
Temporary Equity, Acquisition Of Equity Interests	4,451						(553)	3,898
Net Income	177,379			167,611		8,169	175,780	177,379
Temporary Equity, Dividends	(2,177)
Unrealized gain on interest rate swaps						155	3,328	3,328	3,173
Temporary Equity, Net Income	1,599
Distributions				$ 272,035		10,937	282,972	285,149
Balance at Dec. 31, 2019	3,875,952	$ 932	$ 5,213,264		$ (1,393,141)	$ 56,228	$ 3,875,952	3,953,956	$ (1,331)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Temporary Equity, Stock Issued During Period, Value, New Issues								$ 51,930											$ 51,930
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests	$ 78,004