Consolidated Statement of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Total Stockholders' Equity	Non-controlling Interest-Operating Partnership
Balance at Dec. 31, 2018	$ 1,415,059	$ 1,187	$ 1,807,202	$ (393,330)
Balance (in shares) at Dec. 31, 2018		118,674
Net income	49,340			49,340
Retirement of common stock	(3,070)	$ (1)	(3,069)
Retirement of common stock (in shares)		(143)
Dividends declared on common stock	(52,994)			(52,994)
Restricted stock compensation, net of forfeitures	3,812		3,812
Restricted stock grants		$ 5	(5)
Restricted stock grants (in shares)		521
Stock options exercised	207		207
Stock options exercised (in shares)		16
Cumulative effect of adoption of new accounting standard	(29,940)			(29,940)
Balance at Mar. 31, 2019	1,382,414	$ 1,191	1,808,147	(426,924)
Balance (in shares) at Mar. 31, 2019		119,068
Balance at Dec. 31, 2018	1,415,059	$ 1,187	1,807,202	(393,330)
Balance (in shares) at Dec. 31, 2018		118,674
Net income	97,918
Balance at Jun. 30, 2019	1,382,591	$ 1,191	1,812,611	(431,211)
Balance (in shares) at Jun. 30, 2019		119,096
Balance at Mar. 31, 2019	1,382,414	$ 1,191	1,808,147	(426,924)
Balance (in shares) at Mar. 31, 2019		119,068
Net income	48,578			48,578
Retirement of common stock	(460)		(460)
Retirement of common stock (in shares)		(21)
Dividends declared on common stock	(52,865)			(52,865)
Restricted stock compensation, net of forfeitures	4,256		4,256
Restricted stock grants (in shares)		3
Stock options exercised	668		668
Stock options exercised (in shares)		46
Balance at Jun. 30, 2019	1,382,591	$ 1,191	1,812,611	(431,211)
Balance (in shares) at Jun. 30, 2019		119,096
Balance at Dec. 31, 2019	1,376,749	$ 1,191	1,821,810	(446,252)	$ 1,376,749
Balance (in shares) at Dec. 31, 2019		119,096
Net income	33,238			32,057	32,057	$ 1,181
Retirement of common stock	(3,560)	$ (2)	(3,558)		(3,560)
Retirement of common stock (in shares)		(207)
Dividends declared on common stock	(53,415)			(53,415)	(53,415)
Restricted stock compensation, net of forfeitures	4,610		4,610		4,610
Restricted stock grants		$ 7	(7)
Restricted stock grants (in shares)		740
Cumulative effect of adoption of new accounting standard	(1,036)			(1,036)	(1,036)
Contributions to operating partnership	23,271					23,271
Distributions to non-controlling interest	(1,181)					(1,181)
Balance at Mar. 31, 2020	1,378,676	$ 1,196	1,822,855	(468,646)	1,355,405	23,271
Balance (in shares) at Mar. 31, 2020		119,629
Balance at Dec. 31, 2019	1,376,749	$ 1,191	1,821,810	(446,252)	1,376,749
Balance (in shares) at Dec. 31, 2019		119,096
Net income	55,424
Balance at Jun. 30, 2020	1,405,181	$ 1,196	1,827,174	(446,460)	1,381,910	23,271
Balance (in shares) at Jun. 30, 2020		119,631
Balance at Mar. 31, 2020	1,378,676	$ 1,196	1,822,855	(468,646)	1,355,405	23,271
Balance (in shares) at Mar. 31, 2020		119,629
Net income	22,186			22,186	22,186
Restricted stock compensation, net of forfeitures	4,319		4,319		4,319
Restricted stock grants (in shares)		2
Balance at Jun. 30, 2020	$ 1,405,181	$ 1,196	$ 1,827,174	$ (446,460)	$ 1,381,910	$ 23,271
Balance (in shares) at Jun. 30, 2020		119,631