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Stock-Based Compensation - Share Appreciation Rights (Details) - $ / shares | 12 Months Ended |
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Payment Arrangement [Abstract] |  |  |  |
Stock options outstanding (in shares) | 222,273 | 291,779 | 319,086 | 617,446
Stock options outstanding (in dollars per share) | $ 15.44 | $ 14.05 | $ 13.53 | $ 10.53
SARS outstanding (in shares) | 0 | 32,282 | 42,152 | 42,152
SARs outstanding (in dollars per share) | $ 0 | $ 15.40 | $ 14.14 | $ 14.14
Stock options granted (in shares) | (30,401) | (11,055) | (14,310) |
Stock options granted (in dollars per share) | $ 5.57 | $ 5.57 | $ 7.91 |
SARs granted (in shares) | 0 | 0 | 0 |
SARs granted (in dollars per share) | $ 0 | $ 0 | $ 0 |
Stock options exercised (in shares) | (39,105) | (11,519) | (159,069) |
Stock options exercised (in dollars per share) | $ 12.77 | $ 9.31 | $ 3.35 |
SARs exercised (in shares) | 0 | 0 | 0 |
SARs exercised (in dollars per share) | $ 0 | $ 0 | $ 0 |
Stock options canceled/forfeited (in shares) |  | (4,733) | (153,601) |
Stock options canceled/forfeited (in dollars per share) |  | $ 10.00 | $ 11.48 |
SARs canceled/forfeited (in shares) |  | (9,870) | 0 |
SARs canceled/forfeited (in dollars per share) |  | $ 10.00 | $ 0 |
Stock options expired (in shares) | 0 |  |  |
Stock options expired (in dollars per share) | $ 0 |  |  |
SARs expired (in shares) | (32,282) |  |  |
SARS expired (in dollars per share) | $ 15.40 |  |  |

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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 weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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