Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect Period of Adoption Adjustment	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Deficit Cumulative Effect Period of Adoption Adjustment	Total Stockholders' Equity	Total Stockholders' Equity Cumulative Effect Period of Adoption Adjustment	Non-controlling Interest-Operating Partnership
Balance at Dec. 31, 2017	$ 1,451,608		$ 1,182	$ 1,794,713	$ (344,287)		$ 1,451,608
Balance (in shares) at Dec. 31, 2017			118,204
Net income	159,207				159,207		159,207
Retirement of common stock	(3,005)		$ (1)	(3,004)			(3,005)
Retirement of common stock (in shares)			(139)
Dividends declared on common stock	(205,675)				(205,675)		(205,675)
Restricted stock compensation, net of forfeitures	13,132			13,132			13,132
Restricted stock grants			$ 5	(5)
Restricted stock grants (in shares)			462
Stock options exercised	2,367		$ 1	2,366			2,367
Stock options exercised (in shares)			147
Balance at Dec. 31, 2018	1,415,059	$ (2,575)	$ 1,187	1,807,202	(393,330)	$ (2,575)	1,415,059	$ (2,575)
Balance (in shares) at Dec. 31, 2018			118,674
Net income	188,886				188,886		188,886
Retirement of common stock	(3,531)		$ (2)	(3,529)			(3,531)
Retirement of common stock (in shares)			(164)
Dividends declared on common stock	(211,868)				(211,868)		(211,868)
Restricted stock compensation, net of forfeitures	17,267			17,267			17,267
Restricted stock grants			$ 5	(5)
Restricted stock grants (in shares)			524
Stock options exercised	876		$ 1	875			876
Stock options exercised (in shares)			62
Balance at Dec. 31, 2019	1,376,749	(29,940)	$ 1,191	1,821,810	(446,252)	(29,940)	1,376,749	(29,940)
Balance (in shares) at Dec. 31, 2019			119,096
Net income	55,338				54,157		54,157		$ 1,181
Retirement of common stock	(3,575)		$ (2)	(3,573)			(3,575)
Retirement of common stock (in shares)			(209)
Dividends declared on common stock	(53,415)				(53,415)		(53,415)
Reductions in dividends on RSUs	27				27		27
Restricted stock compensation, net of forfeitures	17,264			17,264			17,264
Restricted stock grants			$ 7	(7)
Restricted stock grants (in shares)			751
Contributions to operating partnership	23,271								23,271
Distributions to non-controlling interest	(1,181)								(1,181)
Balance at Dec. 31, 2020	$ 1,413,442	$ (1,036)	$ 1,196	$ 1,835,494	$ (446,519)	$ (1,036)	$ 1,390,171	$ (1,036)	$ 23,271
Balance (in shares) at Dec. 31, 2020			119,638