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Benefit Plans - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Amortization related to restricted stock/Unit awards and LTIP Unit Awards | $ 2,003 | $ 1,844 | $ 5,689 | $ 6,767
Unrecognized compensation related to unvested restricted stock/Unit awards and LTIP Unit Awards | 10,450 |  | $ 10,450 |
Weighted average period of unrecognized compensation expected to be recognized |  |  | 344 days |
Severance Costs |  |  | $ 1,298 |
Management | Restricted Stock/Unit Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock/Unit awards and LTIP Unit Awards issued |  |  | 211,890 |
Fair value of restricted stock/Unit awards and LTIP Unit Awards issued | 6,068 |  | $ 6,068 |
Vesting period of restricted stock/Unit awards issued |  |  | 3 years |
Compensation expense recognized at date of grant |  |  |  | $ 1,590
Management | LTIP Unit Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock/Unit awards and LTIP Unit Awards issued |  |  | 179,288 |
Fair value of restricted stock/Unit awards and LTIP Unit Awards issued | 2,381 |  | $ 2,381 |
Vesting period of restricted stock/Unit awards issued |  |  | 3 years |
Director | Restricted Stock/Unit Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock/Unit awards and LTIP Unit Awards issued |  |  | 15,169 |
Fair value of restricted stock/Unit awards and LTIP Unit Awards issued | $ 490 |  | $ 490 |
Vesting period of restricted stock/Unit awards issued |  |  | 1 year |

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