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Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Feb. 28, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shelf registration, shares issued (in shares) | 7,000,000 |  |  |  |
Shelf registration, price per share (in dollars per share) | $ 56.50 |  |  |  |
Shelf registration, net proceeds | $ 379,410 |  |  |  |
Stock issuance costs | $ 16,090 |  | $ 17,521 | $ 3,947 | $ 3,836
Net proceeds |  |  | $ 542,280 | $ 345,324 | $ 256,764
Total allowable shares (in shares) |  |  | 375,000,000 | 375,000,000 |
Total shares issued (in shares) |  |  | 171,694,209 | 161,503,585 |
Shares of common stock (in shares) |  |  | 7,000,000 |  |
Net proceeds |  |  | $ 395,500 |  |
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) |  |  | 362,918 | 311,048 | 229,696
Net proceeds |  |  | $ 19,442 | $ 13,264 | $ 9,391
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) |  |  | 9,722,185 |  |
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 |  |
ATM Equity Programs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock issuance costs |  |  | $ 1,431 | $ 3,821 | $ 3,782
Shares of common stock (in shares) |  |  | 2,344,022 | 7,378,163 | 5,821,366
Average price per share (net) (in dollars per share) |  |  | $ 53.71 | $ 44.48 | $ 41.88
Net proceeds |  |  | $ 125,905 | $ 328,196 | $ 243,822

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