| Stock-Based Compensation - Time-based vesting (Details) - shares | 1 Months Ended | 6 Months Ended | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mar. 05, 2019 | Apr. 15, 2019 | Jun. 30, 2019 | ||||||||||||
| LTIP Units outstanding as of June 30, 2019 | 796,000 | |||||||||||||
| Long Tem Incentives Plan Units [Member] | ||||||||||||||
| LTIP units granted | 28 | 3 | ||||||||||||
| Long Tem Incentives Plan Units [Member] | Equity Incentive Plan 2016 [Member] | ||||||||||||||
| LTIP units outstanding as of December 31, 2018 | 588,000 | |||||||||||||
| LTIP units redeemed in cash or forfeited | [1] | (4,000) | ||||||||||||
| LTIP Units outstanding as of June 30, 2019 | 796,000 | |||||||||||||
| Long Tem Incentives Plan Units [Member] | 2018 Performance Program [Member] | ||||||||||||||
| LTIP units granted | [2] | 108,000 | ||||||||||||
| Long Tem Incentives Plan Units [Member] | Discretionary [Member] | ||||||||||||||
| LTIP units granted | [3] | 28,000 | ||||||||||||
| Long Tem Incentives Plan Units [Member] | 2019 Time Based [Member] | ||||||||||||||
| LTIP units granted | [4] | 54,000 | ||||||||||||
| Long Tem Incentives Plan Units [Member] | Independent directors [Member] | ||||||||||||||
| LTIP units granted | [5] | 22,000 | ||||||||||||
| 
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