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Share-based Compensation - Restricted and Deferred Stock Units (Details) - USD ($) |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Feb. 05, 2020 | Jul. 05, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Restricted stock unit |  |  |  |  |  |
Shares |  |  |  |  |  |
Non-vested at beginning of year (in shares) |  |  |  |  | 778,317 |
Granted (in shares) |  |  |  |  | 3,808 |
Dividend equivalents earned (in shares) |  |  |  |  | 16,167 |
Vested (in shares) |  |  |  |  | (117,641) |
Forfeited (in shares) |  |  |  |  | (13,522) |
Non-vested at end of year (in shares) |  |  | 667,129 |  | 667,129 |
Outstanding at end of year (in shares) |  |  | 667,129 |  | 667,129 |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |
Non-vested at beginning of year (in dollars per share) |  |  |  |  | $ 27.27 |
Granted (in dollars per share) |  |  |  |  | 26.26 |
Dividend equivalents earned (in dollars per share) |  |  |  |  | 20.92 |
Vested (in dollars per share) |  |  |  |  | 21.38 |
Forfeited (in dollars per share) |  |  |  |  | 28.45 |
Non-vested at end of year (in dollars per share) |  |  | $ 28.13 |  | 28.13 |
Outstanding at end of year (in dollars per share) |  |  | $ 28.13 |  | $ 28.13 |
Additional disclosures |  |  |  |  |  |
Period over which cost will be recognized | 3 years |  |  |  |  |
Restricted stock unit | Members of management |  |  |  |  |  |
Shares |  |  |  |  |  |
Stock price (in dollars per share) |  | $ 26.26 |  |  |  |
Additional disclosures |  |  |  |  |  |
Compensation expense recognized |  | $ 100,000 |  |  |  |
Vesting percentage (as a percent) |  | 100.00% |  |  |  |
Deferred stock units |  |  |  |  |  |
Shares |  |  |  |  |  |
Non-vested at beginning of year (in shares) |  |  |  |  | 21,261 |
Dividend equivalents earned (in shares) |  |  |  |  | 1,912 |
Vested (in shares) |  |  |  |  | (23,173) |
Outstanding at end of year (in shares) |  |  | 69,406 |  | 69,406 |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |
Non-vested at beginning of year (in dollars per share) |  |  |  |  | $ 23.18 |
Dividend equivalents earned (in dollars per share) |  |  |  |  | 20.91 |
Vested (in dollars per share) |  |  |  |  | 26.29 |
Outstanding at end of year (in dollars per share) |  |  | $ 24.47 |  | $ 24.47 |
RSUs and DSUs |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |
Compensation expense recognized |  |  | $ 1,100,000 | $ 1,000,000.0 | $ 2,200,000 | $ 1,900,000
Amount of compensation cost to be recognized |  |  | $ 9,800,000 |  | $ 9,800,000 |
Period over which cost will be recognized |  |  |  |  | 3 years 2 months 12 days |
Employee stock purchase plan |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |
Remaining shares available for issuance |  |  | 24,761 |  | 24,761 |
Stock option awards |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |
Compensation expense recognized |  |  |  |  | $ 0 | $ 100,000
2010 Equity Incentive Plan | Restricted stock unit | Members of management |  |  |  |  |  |
Shares |  |  |  |  |  |
Granted (in shares) |  | 3,808 |  |  |  |
2020 Equity Incentive Plan |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |
Remaining shares available for issuance |  |  | 1,829,606 |  | 1,829,606 |

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- Definition Weighted average fair value of the dividend equivalents of equity-based award plans other than stock (unit) option plans, earned during the period. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding, as of the balance sheet date. + References No definition available. + Details
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- Definition The weighted-average fair value of outstanding awards on equity-based plans, excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References No definition available. + Details
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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