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Equity Transactions (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2018
Class of Stock [Line Items] |  |  |  |
Common stock, shares authorized (in shares) | 670,000,000 | 670,000,000 |  |
Proceeds from issuance from common stock | $ 72,539 | $ (919) | $ 89,055 |
General partner ownership interest | 96.60% | 96.60% |  |
Redemption value of operating partnership units outstanding | $ 692,500 | $ 565,300 |  |
ATM Program, 2018 |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock, shares authorized (in shares) | 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 |  |  |
ATM Program, 2016 |  |  |  |
Class of Stock [Line Items] |  |  |  |
Sale of common stock, net (in shares) |  |  | 345,444 |
Share issued, price per share (in dollars per share) |  |  | $ 260.38 |
Proceeds from issuance from common stock |  |  | $ 89,900 |
Operating Partnership Units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of shares outstanding | 2,158,396 | 2,171,309 |  |
Long Term Incentive Plan 2014 Units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of shares outstanding | 143,257 | 134,080 |  |

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