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Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Net proceeds |  | $ 345,324 | $ 256,764 | $ 278,040
Total allowable shares (in shares) |  | 375,000,000 | 375,000,000 |
Total shares issued (in shares) |  | 161,503,585 | 153,577,028 |
Shares of common stock (in shares) |  | 40,371 | 35,456 | 31,807
Net proceeds |  | $ 1,375 | $ 1,176 | $ 1,148
Stock issuance costs |  | $ 3,947 | $ 3,836 | $ 15,204
DRIP |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares permitted for issuance (in shares) | 10,000,000 |  |  |
Shares of common stock (in shares) |  | 311,048 | 229,696 | 187,626
Net proceeds |  | $ 13,264 | $ 9,391 | $ 8,340
2018 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 (in shares) |  | 7,378,163 |  |
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 (in shares) |  | 10,044,656 |  |
Shares of common stock (in shares) |  | 7,378,163 | 5,821,366 | 5,716,222
Average price per share (net) (in dollars per share) |  | $ 44.48 | $ 41.88 | $ 46.48
Net proceeds |  | $ 328,196 | $ 243,822 | $ 265,696
Stock issuance costs |  | $ 3,821 | $ 3,782 | $ 4,266
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 (in shares) |  | 9,852,465 |  |

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