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Incentive Compensation - Additional Information (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 17, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense |  | $ 4,241,000 | $ 5,083,000 | $ 9,638,000 | $ 12,685,000 |  |
Equity Incentive Plan [Member] | Full Value Awards [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Shares available for grant |  | 6,975,375 |  | 6,975,375 |  |  |
2016 Performance Program [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Performance measurement period, term |  |  |  |  |  | 3 years |
Performance goals met in percentile based on relative index |  |  |  | 30th percentile |  |  |
Units, Granted | 1,085,244 |  |  |  |  |  |
Earned Units | 216,005 |  |  |  |  |  |
Percentage of earned units | 19.90% |  |  |  |  |  |
Vested units | 107,996 |  |  |  |  |  |
Fair value granted |  |  |  | $ 10,520,000 |  |  |
Unrecognized compensation cost |  | $ 567,000 |  | $ 567,000 |  |  |
Unrecognized compensation cost expected to be recognized over a weighted-average period |  |  |  | 6 months |  |  |
2016 Performance Program [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Remaining units nonvested |  |  |  |  |  |  | 108,009
2019 Performance Program [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Performance measurement period, term | 3 years |  |  |  |  |  |
Performance measurement period, start date | Jan. 01, 2020 |  |  |  |  |  |
Performance measurement period, end date | Dec. 31, 2022 |  |  |  |  |  |
Reduction in percentage on number of LTIP units earned if negative TSR | 30.00% |  |  |  |  |  |
Fair value of awards granted | $ 7,488,250 |  |  |  |  |  |
Vesting period | 4 years |  |  |  |  |  |
2019 Performance Program [Member] | Share-Based Compensation Award Tranche One [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of earned units | 50.00% |  |  |  |  |  |
Percentage of the awards that vest | 50.00% |  |  |  |  |  |
2019 Performance Program [Member] | Share-Based Compensation Award Tranche Two [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of earned units | 50.00% |  |  |  |  |  |
Percentage of the awards that vest | 50.00% |  |  |  |  |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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