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Equity Transactions (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Class of Stock [Line Items] |  |  |  |
Excess of redemption value of preferred stock over the carrying value |  | $ 2,541 | $ 0 | $ 0
Proceeds from issuance from common stock |  | $ (384) | $ 332,137 | $ 531,379
General partner ownership interest (in hundredths) |  | 96.70% | 96.70% |
Redemption value of operating partnership units outstanding |  | $ 520,200 | $ 530,200 |
Series H 7.125% Cumulative Redeemable Preferred Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares issued (in shares) |  |  | 2,950,000 |
Shares outstanding (in shares) | 2,950,000 |  |  |
Cumulative dividend rate (in hundredths) |  | 0.00% | 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 |  |  |
Common Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock, number of shares sold |  | 0 | 1,481,737 |
Common stock issued, average share price (in dollars per share) |  |  | $ 226.46 |
Proceeds from issuance from common stock |  |  | $ 332,300 |
Operating Partnership Units [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares outstanding (in shares) |  | 2,056,263 | 2,070,360 |
Long Term Incentive Plan 2014 Units [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares outstanding (in shares) |  | 181,027 | 144,185 |

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