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Consolidated Statements of Changes in Stockholders' Equity - USD ($) | Total | Common stock [Member] | Preferred Stock [Member] | Common Stock [Member] | Common Stock [Member] Common stock [Member] | Additional Paid In Capital [Member] | Additional Paid In Capital [Member] Common stock [Member] | Returned Earnings/ (Accumulated Deficit) [Member] | Accumulated Other Comprehensive Loss [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (shares) at Dec. 31, 2013 |  |  | 3,450,000 | 36,888,467 |  |  |  |  |
Beginning balance at Dec. 31, 2013 | $ 682,956,000 |  | $ 35,000 | $ 369,000 |  | $ 697,610,000 |  | $ (14,188,000) | $ (870,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Capital increase related to Equity Incentive Plan (shares) |  |  |  | 240,277 |  |  |  |  |
Capital increase related to Equity Incentive Plan | 698,000 |  |  | $ 2,000 |  | 696,000 |  |  |
Issuance of restricted stock (shares) |  |  |  | 65,698 |  |  |  |  |
Issuance of restricted stock | 1,000 |  |  | $ 1,000 |  |  |  |  |
Issuance of stock (in shares) |  |  |  |  | 9,706,000 |  |  |  |
Issuance of stock |  | $ 158,693,000 |  |  | $ 97,000 |  | $ 158,596,000 |  |
Offering costs | (312,000) |  |  |  |  | (312,000) |  |  |
Convertible senior notes | 11,445,000 |  |  |  |  | 11,445,000 |  |  |
Net income | 82,739,000 |  |  |  |  |  |  | 82,739,000 |
Change in Other Comprehensive Income (loss) | (2,115,000) |  |  |  |  |  |  |  | (2,115,000)
Dividends on preferred stock | (7,440,000) |  |  |  |  |  |  | (7,440,000) |
Dividends on common stock ($1.84 per share for 2016 and $1.78 for 2015 and $1.60 2014) | (71,596,000) |  |  |  |  |  |  | (71,596,000) |
Ending balance at Dec. 31, 2014 | 855,069,000 |  | $ 35,000 | $ 469,000 |  | 868,035,000 |  | (10,485,000) | (2,985,000)
Ending balance (shares) at Dec. 31, 2014 |  |  | 3,450,000 | 46,900,442 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Capital increase related to Equity Incentive Plan (shares) |  |  |  | 12,763 |  |  |  |  |
Capital increase related to Equity Incentive Plan | 4,265,000 |  |  | $ 0 |  | 4,265,000 |  |  |
Issuance of restricted stock (shares) |  |  |  | 65,950 |  |  |  |  |
Issuance of restricted stock | 1,000 |  |  | $ 1,000 |  |  |  |  |
Issuance of stock (in shares) |  |  | 8,000,000 |  | 20,323,529 |  |  |  |
Issuance of stock | 197,680,000 | 343,430,000 | $ 80,000 |  | $ 203,000 | 197,600,000 | 343,227,000 |  |
Repurchase of common stock (in shares) |  |  |  | (107,432) |  |  |  |  |
Repurchase of common stock | (1,741,000) |  |  | $ (1,000) |  | (1,740,000) |  |  |
Offering costs | (1,249,000) |  |  |  |  | (1,249,000) |  |  |
Net income | 103,256,000 |  |  |  |  |  |  | 103,256,000 |
Change in Other Comprehensive Income (loss) | (188,000) |  |  |  |  |  |  |  | (188,000)
Dividends on preferred stock | (11,884,000) |  |  |  |  |  |  | (11,884,000) |
Dividends on common stock ($1.84 per share for 2016 and $1.78 for 2015 and $1.60 2014) | (113,215,000) |  |  |  |  |  |  | (113,215,000) |
Ending balance at Dec. 31, 2015 | 1,375,424,000 |  | $ 115,000 | $ 672,000 |  | 1,410,138,000 |  | (32,328,000) | (3,173,000)
Ending balance (shares) at Dec. 31, 2015 |  |  | 11,450,000 | 67,195,252 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Capital increase related to Equity Incentive Plan (shares) |  |  |  | 236,782 |  |  |  |  |
Capital increase related to Equity Incentive Plan | 4,461,000 |  |  | $ 2,000 |  | 4,459,000 |  |  |
Issuance of restricted stock (shares) |  |  |  | 92,056 |  |  |  |  |
Issuance of restricted stock | 1,000 |  |  | $ 1,000 |  |  |  |  |
Issuance of stock (in shares) |  |  |  |  | 10,500,000 |  |  |  |
Issuance of stock |  | $ 178,185,000 |  |  | $ 105,000 |  | $ 178,080,000 |  |
Offering costs | (361,000) |  |  |  |  | (361,000) |  |  |
Net income | 157,876,000 |  |  |  |  |  |  | 157,876,000 |
Change in Other Comprehensive Income (loss) | (638,000) |  |  |  |  |  |  |  | (638,000)
Dividends on preferred stock | (30,295,000) |  |  |  |  |  |  | (30,295,000) |
Dividends on common stock ($1.84 per share for 2016 and $1.78 for 2015 and $1.60 2014) | (143,323,000) |  |  |  |  |  |  | (143,323,000) |
Issuance of preferred stock - Merger (shares) |  |  | 6,900,000 |  |  |  |  |  |
Issuance of preferred stock - Merger | 172,500,000 |  | $ 69,000 |  |  | 172,431,000 |  |  |
Issuance of common stock- Merger (shares) |  |  |  | 13,398,586 |  |  |  |  |
Issuance of common stock- Merger | 218,397,000 |  |  | $ 134,000 |  | 218,263,000 |  |  |
Ending balance at Dec. 31, 2016 | $ 1,932,227,000 |  | $ 184,000 | $ 914,000 |  | $ 1,983,010,000 |  | $ (48,070,000) | $ (3,811,000)
Ending balance (shares) at Dec. 31, 2016 |  |  | 18,350,000 | 91,422,676 |  |  |  |  |

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