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Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Net proceeds |  | $ 256,764 | $ 278,040 | $ 332,117
Total allowable shares (in shares) |  | 375,000,000 | 375,000,000 |
Total shares issued as of December 31, 2017 (in shares) |  | 153,577,028 | 147,149,945 |
Shares of common stock (in shares) |  | 35,456 | 31,807 | 34,230
Net proceeds |  | $ 1,176 | $ 1,148 | $ 991
Stock issuance costs |  | $ 3,836 | $ 15,204 | $ 4,198
DRIP |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares reserved for future issuance, dividend reinvestment plan (in shares) | 16,000,000 |  |  |
Shares of common stock (in shares) |  | 229,696 | 187,626 | 196,584
Net proceeds |  | $ 9,391 | $ 8,340 | $ 7,182
2016 ATM Equity Program |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total allowable shares (in shares) |  | 12,000,000 |  |
Total shares issued as of December 31, 2017 (in shares) |  | 10,044,656 |  |
Shares of common stock (in shares) |  | 5,821,366 | 5,716,222 | 8,573,533
Average stock price per share (net) (in USD per share) |  | $ 41.88 | $ 46.48 | $ 37.45
Net proceeds |  | $ 243,822 | $ 265,696 | $ 321,067
Stock issuance costs |  | $ 3,782 | $ 4,266 | $ 4,016
2015 ATM Equity Program |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total allowable shares (in shares) |  | 10,000,000 |  |
Total shares issued as of December 31, 2017 (in shares) |  | 9,852,465 |  |
2013 ATM Equity Program |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total allowable shares (in shares) |  | 9,000,000 |  |
Total shares issued as of December 31, 2017 (in shares) |  | 6,252,812 |  |

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