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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Deficit
--- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2012 | $ 1,695,113 | $ 1,951 | $ 1,976,200 | $ (283,038)
Beginning balance, shares at Dec. 31, 2012 |  | 195,145,707 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Dividends per common share | (66,753) |  | 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 | 49,065 |  |  | 49,065
Ending Balance at Dec. 31, 2013 | 1,680,691 | $ 1,955 | 1,979,613 | (300,877)
Ending balance, shares at Dec. 31, 2013 |  | 195,470,791 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Dividends per common share | (81,041) |  | 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 | 163,377 |  |  | 163,377
Ending Balance at Dec. 31, 2014 | 1,828,987 | $ 2,000 | 2,045,755 | (218,768)
Ending balance, shares at Dec. 31, 2014 |  | 199,964,041 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Dividends per common share | (100,789) |  | 353 | (101,142)
Issuance and vesting of common stock grants, net | 2,987 | $ 2 | 2,985 |
Issuance and vesting of common stock grants, net, shares |  | 253,130 |  |
Sale of common stock in secondary offerings, less placement fees and expenses | 7,790 | $ 5 | 7,785 |
Sale of common stock in secondary offerings, less placement fees and expenses, shares |  | 524,606 |  |
Net income | 85,630 |  |  | 85,630
Ending Balance at Dec. 31, 2015 | $ 1,824,605 | $ 2,007 | $ 2,056,878 | $ (234,280)
Ending balance, shares at Dec. 31, 2015 |  | 200,741,777 |  |

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