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Incentive Plan - Summary of Option Activity (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Number of Shares |  |  |
Number of shares, outstanding at beginning of year (in shares) | 2,838,867 | 2,424,032 | 2,340,842
Number of shares, granted (in shares) | 0 | 699,651 | 461,407
Number of shares, exercised (in shares) | (264,717) | (213,506) | (227,189)
Number of shares, forfeited (in shares) | (1,828) | (6,357) | (149,158)
Number of shares, expired (in shares) | (114,067) | (64,953) | (1,870)
Number of shares, outstanding at end of year (in shares) | 2,458,255 | 2,838,867 | 2,424,032
Number of shares, options exercisable at end of year (in shares) | 1,583,521 | 1,596,927 | 1,612,946
Weighted Average Exercise Price |  |  |
Weighted average exercise price, outstanding at beginning of year (in dollars per share) | $ 20.67 | $ 19.80 | $ 18.25
Weighted average exercise price, granted (in dollars per share) | 0 | 20.44 | 25.20
Weighted average exercise price, exercised (in dollars per share) | 14.80 | 9.50 | 11.24
Weighted average exercise price, forfeited (in dollars per share) | 23.78 | 21.26 | 24.71
Weighted average exercise price, expired (in dollars per share) | 26.62 | 22.51 | 29.59
Weighted average exercise price, outstanding at end of year (in dollars per share) | $ 21.02 | $ 20.67 | $ 19.80

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option 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)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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