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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, 2013 | $ 1,680,691 | $ 1,955 | $ 1,979,613 | $ (300,877)
Beginning 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 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Dividends per common share | (100,738) |  | 358 | (101,096)
Issuance and vesting of common stock grants, net | 4,636 | $ 2 | 4,634 |
Issuance and vesting of common stock grants, net, shares |  | 187,362 |  |
Net income | 114,796 |  |  | 114,796
Repurchase of common shares, shares |  | (728,237) |  |
Repurchase of common stock, value | (6,512) | $ (7) | (6,505) | 0
Ending Balance at Dec. 31, 2016 | $ 1,836,787 | $ 2,002 | $ 2,055,365 | $ (220,580)
Ending balance, shares at Dec. 31, 2016 |  | 200,200,902 |  |

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