Consolidated Statement of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock	Preferred Stock	Preferred Stock	Common Stock	Common Stock	Additional Paid-in Capital	Additional Paid-in Capital Common Stock	Additional Paid-in Capital Preferred Stock	Cumulated Distributions in Excess of Net Income	Noncontrolling Interest [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total Stockholders' Equity Before Noncontrolling Interests [Member] Preferred Stock
Balance at Dec. 31, 2011	$ 326,573			$ 0	$ 369		$ 344,995			$ (18,791)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	305,488										0
Common stock, shares outstanding					37,099,209
Net income	19,513									19,513
Net income	19,513
Amortization of stock based compensation	8,817						8,817
Stock issuance, shares						207,497
Stock issuance		51				2		49
Common dividends	(49,466)									(49,466)
Preferred stock, shares outstanding				0
Balance at Dec. 31, 2012	305,488			0	371		353,861			(48,744)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	460,164
Common stock, shares outstanding	38,788,745				38,788,745
Net income	33,715									33,715
Net income	33,715
Amortization of stock based compensation	8,707						8,707
Stock issuance, shares				5,750,000		1,689,536
Stock issuance		33,896	138,250	58		17		33,879	138,192				138,250
Preferred dividends										(7,966)
Common dividends	(51,926)									(51,926)
Preferred stock, shares outstanding	5,750,000			5,750,000
Balance at Dec. 31, 2013	460,164			58	388		534,639			(74,921)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	941,823										(43)
Common stock, shares outstanding	59,047,001				59,047,001
Net income	46,952									46,952
Net income	46,909										(43)
Other Comprehensive Income (Loss), Net of Tax	(1,542)											(1,542)
Amortization of stock based compensation	11,234						11,234
Stock issuance, shares						20,258,256
Stock issuance		507,930				202		507,728
Preferred dividends										(10,242)
Common dividends	(72,630)									(72,630)
Preferred stock, shares outstanding	5,750,000			5,750,000
Balance at Dec. 31, 2014	$ 941,866			$ 58	$ 590		$ 1,053,601			$ (110,841)		$ (1,542)