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Equity Transactions (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Apr. 30, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018
Class of Stock [Line Items] |  |  |  |  |
Excess of redemption value of preferred stock over the carrying value |  | $ 0 | $ 0 | $ 2,541 |
Common stock, shares authorized |  | 670,000,000 | 670,000,000 |  |
Proceeds from issuance from common stock |  | $ (919) | $ 89,055 | $ (384) |
General partner ownership interest |  | 96.60% | 96.70% |  |
Redemption value of operating partnership units outstanding |  | $ 565,300 | $ 547,500 |  |
ATM Program, 2018 [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common stock, shares authorized |  | 900,000,000.0 |  |  | 900,000,000.0
ATM Program, 2016 [Member] |  |  |  |  |
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 |  |  | $ 89,100 |  |
Series H 7.125% Cumulative Redeemable Preferred Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of shares outstanding | 2,950,000 |  |  |  |
Cumulative dividend rate | 7.125% |  |  |  |
Liquidation preference (in dollars per share) | $ 25.00 |  |  |  |
Liquidation preference | $ 73,800 |  |  |  |
Excess of redemption value of preferred stock over the carrying value | $ 2,500 |  |  |  |
Operating Partnership Units [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of shares outstanding |  | 2,171,309 | 2,054,814 |  |
Long Term Incentive Plan 2014 Units [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of shares outstanding |  | 134,080 | 213,300 |  |

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