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Consolidated Statements of Equity - USD ($) $ in Thousands | Total | Common Stock | Series B Redeemable Preferred Stock | Additional Paid-in Capital | Accumulated Deficit | Accumulated Other Comprehensive (Loss) Income | Non-controlling interest—Units in the operating partnership | Non-controlling interest—Members in Consolidated Entities
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2014 | $ 1,275,015 | $ 668 | $ 145,000 | $ 1,070,833 | $ (34,884) | $ (2,443) | $ 52,851 | $ 42,990
Beginning balance (in shares) at Dec. 31, 2014 |  | 66,797,816 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Contributions | 217,795 |  |  |  |  |  |  | 217,795
Distributions | (2,013) |  |  |  |  |  |  | (2,013)
Proceeds from sale of common stock, net of underwriters’ discount and transaction costs | 380,620 | $ 127 |  | 380,493 |  |  |  |
Proceeds from sale of common stock, net of underwriters' discount and transaction costs (in shares) |  | 12,650,000 |  |  |  |  |  |
Redemption of Series B preferred stock | (145,000) |  | (145,000) |  |  |  |  |
Issuance of common units for acquisition properties | 1,814,936 |  |  |  |  |  | 1,814,936 |
Issuance of unrestricted stock | 285,445 | $ 87 |  | 285,358 |  |  |  |
Issuance of unrestricted stock (in shares) |  | 8,820,482 |  |  |  |  |  |
Issuance of restricted stock | 0 |  |  |  |  |  |  |
Issuance of restricted stock (in shares) |  | 36,223 |  |  |  |  |  |
Shares withheld to satisfy tax withholding | (5,128) |  |  | (5,128) |  |  |  |
Shares withheld to satisfy tax withholding (in shares) |  | (85,469) |  |  |  |  |  |
Declared dividend | (87,344) |  | (11,469) | (50,244) |  |  | (25,631) |
Amortization of stock-based compensation | 8,832 |  |  | 8,832 |  |  |  |
Net income (loss) | (16,718) |  | 11,469 |  | (10,071) |  | (21,969) | 3,853
Change in fair value of derivatives | 2,597 |  |  |  |  | 1,362 | 1,235 |
Exchange of common units in the operating partnership for common stock | 0 | $ 9 |  | 20,835 |  |  | (20,844) |
Exchange of Non-controlling Interests — common units in the operating partnership for common stock (in shares) |  | 934,728 |  |  |  |  |  |
Change in fair value of derivatives | 2,597 |  |  |  |  |  |  |
Ending balance at Dec. 31, 2015 | 3,729,037 | $ 891 | 0 | 1,710,979 | (44,955) | (1,081) | 1,800,578 | 262,625
Ending balance (in shares) at Dec. 31, 2015 |  | 89,153,780 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Contributions | 33,996 |  |  |  |  |  |  | 33,996
Distributions | (1,303) |  |  |  |  |  |  | (1,303)
Proceeds from sale of common stock, net of underwriters’ discount and transaction costs | 1,449,581 | $ 470 |  | 1,449,111 |  |  |  |
Proceeds from sale of common stock, net of underwriters' discount and transaction costs (in shares) |  | 47,010,695 |  |  |  |  |  |
Issuance of unrestricted stock | 6 | $ 6 |  |  |  |  |  |
Issuance of unrestricted stock (in shares) |  | 590,520 |  |  |  |  |  |
Shares withheld to satisfy tax withholding | (8,427) | $ (3) |  | (8,424) |  |  |  |
Shares withheld to satisfy tax withholding (in shares) |  | (262,760) |  |  |  |  |  |
Declared dividend | (117,819) |  |  | (90,005) |  |  | (27,814) |
Amortization of stock-based compensation | 14,654 |  |  | 13,609 |  |  | 1,045 |
Net income (loss) | 43,122 |  |  |  | 27,984 |  | 5,848 | 9,290
Change in fair value of derivatives | 5,942 |  |  |  |  | 10,577 | (4,635) |
Redemption of common units in the operating partnership | (1,446,039) |  |  | 34,124 |  |  | (1,480,163) |
Ending balance at Dec. 31, 2016 | $ 3,702,750 | $ 1,364 | 0 | 3,109,394 | (16,971) | 9,496 | 294,859 | 304,608
Ending balance (in shares) at Dec. 31, 2016 | 136,492,235 | 136,492,235 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Contributions | $ 3,870 |  |  |  |  |  |  | 3,870
Distributions | (74,836) |  |  |  |  |  |  | (74,836)
Proceeds from sale of common stock, net of underwriters’ discount and transaction costs | 647,382 | $ 187 |  | 647,195 |  |  |  |
Proceeds from sale of common stock, net of underwriters' discount and transaction costs (in shares) |  | 18,656,575 |  |  |  |  |  |
Issuance of unrestricted stock | 0 | $ 9 |  | (9) |  |  |  |
Issuance of unrestricted stock (in shares) |  | 917,086 |  |  |  |  |  |
Shares withheld to satisfy tax withholding | (16,041) | $ (4) |  | (16,037) |  |  |  |
Shares withheld to satisfy tax withholding (in shares) |  | (463,388) |  |  |  |  |  |
Declared dividend | (158,544) |  |  | (106,269) | (51,619) |  | (656) |
Amortization of stock-based compensation | 15,915 |  |  | 13,249 |  |  | 2,666 |
Net income (loss) | 93,925 |  |  |  | 68,590 |  | 375 | 24,960
Change in fair value of derivatives | 1,500 |  |  |  |  |  |  |
Change in fair value of derivatives | 7,398 |  |  |  |  | 7,353 | 45 |
Redemption of common units in the operating partnership | (310,855) |  |  | (24,535) |  | (3,622) | (282,698) |
Ending balance at Dec. 31, 2017 | $ 3,910,964 | $ 1,556 | $ 0 | $ 3,622,988 | $ 0 | $ 13,227 | $ 14,591 | $ 258,602
Ending balance (in shares) at Dec. 31, 2017 | 155,602,508 | 155,602,508 |  |  |  |  |  |

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