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Share-Based Compensation (Details) $ / shares in Units, $ in Thousands |  |  | 6 Months Ended
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Jan. 18, 2019 shares | Jan. 01, 2019 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) Form Percentile_Rank $ / shares shares
PIUs |  |  |
Share-Based Compensation |  |  |
Number of forms of executive compensation | Form |  |  | 2
Time-based PIU's |  |  |
Share-Based Compensation |  |  |
Stock awards granted (in shares or units) | shares |  |  | 61,820
Aggregate grant date fair value | $ |  |  | $ 1,600
Aggregate grant date fair value (in dollars per share) | $ / shares |  |  | $ 26.01
Annual award vesting rights (percent) |  |  | 33.33%
Award vesting period |  |  | 3 years
Restricted shares |  |  |
Share-Based Compensation |  |  |
Stock awards granted (in shares or units) | shares |  |  | 171,520
Aggregate grant date fair value | $ |  |  | $ 4,500
Aggregate grant date fair value (in dollars per share) | $ / shares |  |  | $ 26.22
Shares vested (in shares) | shares |  |  | 171,028
Weighted average fair value of shares vested (in dollars per share) | $ / shares |  |  | $ 28.03
Aggregate intrinsic value of awards upon vesting | $ |  |  | $ 4,500
Deferred share awards |  |  |
Share-Based Compensation |  |  |
Stock awards granted (in shares or units) | shares |  |  | 3,432
Aggregate grant date fair value | $ |  |  | $ 95
Aggregate grant date fair value (in dollars per share) | $ / shares |  |  | $ 27.60
Shares vested (in shares) | shares |  |  | 3,097
Weighted average fair value of shares vested (in dollars per share) | $ / shares |  |  | $ 26.77
Aggregate intrinsic value of awards upon vesting | $ |  |  | $ 86
2016 PSU Grants | Performance share units | Executives |  |  |
Share-Based Compensation |  |  |
Shares issued (in shares) | shares | 44,757 |  |
Percentage of target | 157.00% |  |
2019 PIU Grants | Performance-based PIU's |  |  |
Share-Based Compensation |  |  |
Stock awards granted (in shares or units) | shares |  | 193,682 |
Aggregate grant date fair value | $ |  | $ 2,400 |
Aggregate grant date fair value (in dollars per share) | $ / shares |  | $ 12.47 |
Award vesting period |  | 3 years |
Potential earned PSUs payout for defined levels of performance under awards |  |  |
Earned PB-PIUs payout (as a percent of PB-PIUs granted) on 75th or greater percentile rank |  | 100.00% |
Earned PB-PIUs payout (as a percent of PB-PIUs granted) on 50th percentile rank |  | 50.00% |
Earned PB-PIUs payout (as a percent of PB-PIUs granted) on 25th percentile rank |  | 25.00% |
Earned PB-PIUs granted on percentile rank below 25th (as a percent) |  | 0.00% |
The number of percentile ranks to fall between to earn interpolated PB-PIUs between such percentile ranks, conditioned on the percentile rank exceeding 25% | Percentile_Rank |  |  | 2
Assumptions used to value stock awards |  |  |
Percent of award distribution rights |  |  | 10.00%
Award performance period |  |  | 3 years
Baseline value per common share (in dollars per share) | $ / shares |  | $ 21.03 |
Expected volatility of common shares (as a percent) |  | 21.00% |
Risk-free interest rate (as a percent) |  | 2.51% |

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- Definition The number of percentile ranks to fall between to earn interpolated PSUs between such percentile ranks, conditioned on the percentile rank exceeding 25%. + References No definition available. + Details
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- Definition The aggregate 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 No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Distribution Rights as a Percentage of Non-PIU Common Units, Percentage + References No definition available. + Details
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- Definition Represents the earned payout, as a percentage of units granted, if the entity's total shareholder return relative to a peer group of companies ranks at the 25th percentile. + References No definition available. + Details
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- Definition Represents the earned payout, as a percentage of units granted, if the entity's total shareholder return relative to a peer group of companies ranks at the 50th percentile. + References No definition available. + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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=109197908&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=109197908&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the 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 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)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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)(iv) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + 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=109197908&loc=d3e5070-113901 + Details
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