Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]
Beginning Balance at Dec. 31, 2011	$ 1,502,157us-gaap_StockholdersEquity	$ 1,675	$ 1,708,427	$ (207,945)
Beginning balance, shares at Dec. 31, 2011		167,502,359
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends per common share	(58,327)us-gaap_DividendsCommonStockCash		174	(58,501)
Issuance and vesting of common stock grants, net	1,562	4	1,558
Issuance and vesting of common stock grants, net, shares		431,810
Sale of common stock in secondary offerings, less placement fees and expenses	199,790	200	199,590
Sale of common stock in secondary offerings, less placement fees and expenses, shares		20,000,000
Issuance of common stock in private placement for portfolio acquisition	66,523	72	66,451
Issuance of common stock in private placement for portfolio acquisition, shares		7,211,538
Net income (loss)	(16,592)us-gaap_NetIncomeLoss			(16,592)
Ending Balance	1,695,113us-gaap_StockholdersEquity	1,951	1,976,200	(283,038)
Ending balance, shares at Dec. 31, 2012		195,145,707
Beginning Balance at Dec. 31, 2012	1,695,113us-gaap_StockholdersEquity	1,951	1,976,200	(283,038)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends per common share	(66,753)us-gaap_DividendsCommonStockCash		151	(66,904)
Issuance and vesting of common stock grants, net	3,266	4	3,262
Issuance and vesting of common stock grants, net, shares		325,084
Net income (loss)	49,065us-gaap_NetIncomeLoss			49,065
Ending Balance	1,680,691us-gaap_StockholdersEquity	1,955	1,979,613	(300,877)
Ending balance, shares at Dec. 31, 2013		195,470,791
Beginning Balance at Dec. 31, 2013	1,680,691us-gaap_StockholdersEquity	1,955	1,979,613	(300,877)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends per common share	(81,041)us-gaap_DividendsCommonStockCash		227	(81,268)
Issuance and vesting of common stock grants, net	2,898	3	2,895
Issuance and vesting of common stock grants, net, shares		275,690
Sale of common stock in secondary offerings, less placement fees and expenses	63,062	42	63,020
Sale of common stock in secondary offerings, less placement fees and expenses, shares		4,217,560
Net income (loss)	163,377us-gaap_NetIncomeLoss			163,377
Ending Balance	$ 1,828,987us-gaap_StockholdersEquity	$ 2,000	$ 2,045,755	$ (218,768)
Ending balance, shares at Dec. 31, 2014		199,964,041

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury.

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