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Equity Transactions (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018
Class of Stock [Line Items] |  |  |  |
Common stock, shares authorized | 670,000,000 | 670,000,000 |  |
Proceeds from issuance from common stock | $ (296) | $ 72,539 | $ (919) |
Redemption value of operating partnership units outstanding | $ 544,800 | $ 692,500 |  |
Operating Partnership |  |  |  |
Class of Stock [Line Items] |  |  |  |
General partner ownership interest | 96.60% |  |  |
ATM Program, 2018 |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock, shares authorized | 826,600,000 |  |  | 900,000,000.0
Sale of common stock, net (in shares) |  | 228,271 |  |
Share issued, price per share (in dollars per share) |  | $ 321.56 |  |
Proceeds from issuance from common stock |  | $ 73,400 |  |
Operating Partnership Units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of shares outstanding | 2,188,623 | 2,158,396 |  |
Long Term Incentive Plan 2014 Units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of shares outstanding | 106,137 | 143,257 |  |

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