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Capital - Incentive and Share-based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | May 16, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Retirement age (in years) |  |  |  | 65 years | 60 years | 65 years |  |
Expected volatility rate look-back period (in years) |  |  |  |  |  | 6 years |  |
Weighted-average per unit or share fair value (in USD per share) |  |  |  |  |  | $ 8.55 |  |
Period of service, upon completion of which, grantee's LTIP unit and restricted stock awards will immediately vest (in years) |  |  |  |  |  | 10 years |  |
Minimum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Age of grantee at which LTIP unit and restricted stock awards immediately vest (in years) |  |  |  |  |  | 60 years |  |
Maximum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Age of grantee at which LTIP unit and restricted stock awards immediately vest (in years) |  |  |  |  |  | 65 years |  |
Awards that meet age and service requirements for vesting |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Noncash share-based compensation expense recognized |  |  | $ 400 |  | $ 300 | $ 1,400 | $ 1,900 |
Unrecognized compensation expense | $ 2,300 |  | 2,300 |  |  | $ 2,300 |  |
Unrecognized compensation expense, period for recognition (in years) |  |  |  |  |  | 2 years 6 months |  |
Awards that do not meet age and service requirements for vesting |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Noncash share-based compensation expense recognized |  |  | 4,800 |  | $ 8,500 | $ 8,600 | $ 12,800 |
Unrecognized compensation expense | $ 34,700 |  | $ 34,700 |  |  | $ 34,700 |  |
Unrecognized compensation expense, period for recognition (in years) |  |  |  |  |  | 2 years 6 months |  |
Long-term incentive plan units and restricted stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Fair value of share-based awards granted in period |  |  |  |  |  | $ 19,800 |  |
Weighted-average per unit or share fair value (in USD per share) |  |  |  |  |  | $ 8.55 |  |
Dividend rate (as a percent) |  |  |  |  |  | 2.60% |  |
Risk free interest rate, minimum (as a percent) |  |  |  |  |  | 0.12% |  |
Risk free interest rate, maximum (as a percent) |  |  |  |  |  | 0.32% |  |
Expected price volatility, minimum (as a percent) |  |  |  |  |  | 36.00% |  |
Expected price volatility, maximum (as a percent) |  |  |  |  |  | 53.00% |  |
Long-term incentive plan units and restricted stock | Minimum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Expected term (in years) |  |  |  |  |  | 2 years |  |
Long-term incentive plan units and restricted stock | Maximum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Expected term (in years) |  |  |  |  |  | 5 years 3 months 18 days |  |
Time based long-term incentive plan unit |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Threshold of continuous service for retirement eligibility (in years) |  |  |  |  |  | 10 years |  |
Time based long-term incentive plan unit | Minimum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period (in years) |  |  |  |  |  | 3 years |  |
Time based long-term incentive plan unit | Maximum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period (in years) |  |  |  |  |  | 5 years |  |
Time based long-term incentive plan unit | Median |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period (in years) |  |  |  |  |  | 4 years |  |
Market based long-Term incentive plan unit | Minimum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period (in years) |  |  |  |  |  | 3 years |  |
Market based long-Term incentive plan unit | Maximum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period (in years) |  |  |  |  |  | 4 years |  |
Market based long-Term incentive plan unit | Executive officer | 2019 Plan Units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Reduction of grants (in shares) |  | 666,933 |  |  |  |  |  |
Fair value of reduction of share-based awards granted in period |  | $ 2,800 |  |  |  |  |  |
Market based long-Term incentive plan unit | Certain other employees | 2019 Plan Units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Reduction of grants (in shares) |  | 99,630 |  |  |  |  |  |
Fair value of reduction of share-based awards granted in period |  | $ 500 |  |  |  |  |  |
2019 Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized under the plan (in shares) | 11,000,000.0 |  | 11,000,000.0 |  |  | 11,000,000.0 |  | 11,000,000.0
Number of shares that remain available for future issuance (in shares) | 7,700,000 |  | 7,700,000 |  |  | 7,700,000 |  |
2019 Plan | Time based long-term incentive plan unit |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares granted (in shares) | 8,324 |  |  |  |  |  |  |
Fair value of share-based awards granted in period | $ 100 |  |  |  |  |  |  |
2019 Plan | Time based long-term incentive plan unit | Director |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Annual base retainer | $ 200 |  | $ 200 |  |  | $ 200 |  |
Vesting percentage of award face amount | 120.00% |  | 120.00% |  |  | 120.00% |  |
Shares granted (in shares) | 126,713 |  |  |  |  |  |  |
Fair value of share-based awards granted in period | $ 1,400 |  |  |  |  |  |  |
2019 Plan | Time based long-term incentive plan unit | Director | Minimum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period (in years) | 3 years |  |  |  |  |  |  |
2019 Plan | Time based long-term incentive plan unit | Director | Maximum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period (in years) | 4 years |  |  |  |  |  |  |
2019 Plan | Time based long-term incentive plan unit | Director | Tranche one |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting percentage | 60.00% |  |  |  |  |  |  |
Award vesting period (in years) | 4 years |  |  |  |  |  |  |
2019 Plan | Time based long-term incentive plan unit | Director | Tranche two |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting percentage | 40.00% |  |  |  |  |  |  |
Award vesting period (in years) | 3 years |  |  |  |  |  |  |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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