Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]
Beginning balance (in shares) at Dec. 31, 2016			47,414,365
Beginning balance at Dec. 31, 2016	$ 811,805	$ 46,000	$ 474	$ 766,229	$ 0	$ (898)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	53,095				53,095
Issuance of common stock, net of issuance costs (in shares)			8,066,150
Issuance of common stock, net of issuance costs	256,724		$ 79	256,645
Repurchase of common stock (in shares)			(144,025)
Repurchase of common stock	(3,436)			(3,436)
Redemption of preferred stock	(46,038)	(46,000)		1,729	(1,767)
Issuance of restricted stock (in shares)			32,247
Stock-based compensation	2,017			2,017
Common stock dividends	(44,564)				(44,564)
Preferred stock dividends	(1,961)				(1,961)
Other comprehensive income (loss)	(148)					(148)
Ending balance (in shares) at Dec. 31, 2017			55,368,737
Ending balance at Dec. 31, 2017	1,027,494	0	$ 553	1,023,184	4,803	(1,046)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	63,289				63,289
Issuance of common stock, net of issuance costs (in shares)			5,698,326
Issuance of common stock, net of issuance costs	212,221		$ 57	212,164
Repurchase of common stock (in shares)			(107,267)
Repurchase of common stock	(3,870)			(3,870)
Issuance of restricted stock (in shares)			53,915
Stock-based compensation	2,285			2,285
Common stock dividends	(53,907)				(53,907)
Other comprehensive income (loss)	285					285
Ending balance (in shares) at Dec. 31, 2018			61,013,711
Ending balance at Dec. 31, 2018	1,247,797	0	$ 610	1,233,763	14,185	(761)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	55,516				55,516
Issuance of common stock, net of issuance costs (in shares)			6,271,863
Issuance of common stock, net of issuance costs	280,499		$ 63	280,436
Repurchase of common stock (in shares)			(143,886)
Repurchase of common stock	(3,959)			(3,959)
Issuance of restricted stock (in shares)			111,099
Stock-based compensation	4,026			4,026
Common stock dividends	(67,080)				(67,080)
Other comprehensive income (loss)	324					324
Ending balance (in shares) at Dec. 31, 2019			67,252,787
Ending balance at Dec. 31, 2019	$ 1,517,123	$ 0	$ 673	$ 1,514,266	$ 2,621	$ (437)