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Share-Based Compensation - Restricted Stock (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended | 36 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2021
Restricted Stock [Member] |  |  |  |
Unvested restricted stock |  |  |  |
Outstanding at the beginning of the period (in shares)) | 49,000 |  |  |
Granted (in shares) | 83,000 |  |  |
Vested (in shares) | (24,000) |  |  |
Forfeited (in shares) | (6,000) |  |  |
Outstanding at the end of the period (in shares) | 102,000 | 49,000 |  | 102,000
Weighted-Average Grant-Date Fair Value |  |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 226.06 |  |  |
Granted (in dollars per share) | 105.44 |  |  |
Vested (in dollars per share) | 261.96 |  |  |
Forfeited (in dollars per share) | 95.99 |  |  |
Outstanding at the end of the period (in dollars per share) | $ 127.00 | $ 226.06 |  | $ 127.00
Total future compensation cost related to unvested awards that are expected to vest | $ 8.2 |  |  | $ 8.2
Restricted Stock [Member] | Employees and Director [Member] |  |  |  |
Unvested restricted stock |  |  |  |
Granted (in shares) | 82,722 | 4,156 | 65,299 |
Restricted Stock [Member] | Maximum |  |  |  |
Weighted-Average Grant-Date Fair Value |  |  |  |
Vesting period of shares | 4 years |  |  |
Restricted Stock [Member] | Maximum | Employees and Director [Member] |  |  |  |
Weighted-Average Grant-Date Fair Value |  |  |  |
Vesting period of shares | 4 years | 4 years | 4 years |
Restricted Stock Based on Performance Conditions [Member] | Certain Executive Officers |  |  |  |
Unvested restricted stock |  |  |  |
Granted (in shares) | 95,902 | 31,204 |  |
Weighted-Average Grant-Date Fair Value |  |  |  |
Vesting period of shares | 3 years |  |  |
Restricted Stock Based on Performance Conditions [Member] | Executive Officers |  |  |  |
Unvested restricted stock |  |  |  |
Outstanding at the beginning of the period (in shares)) | 98,000 |  |  |
Granted (in shares) |  | 59,490 | 48,253 |
Vested (in shares) | (42,000) |  |  |
Outstanding at the end of the period (in shares) | 56,000 | 98,000 |  | 56,000
Weighted-Average Grant-Date Fair Value |  |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 163.74 |  |  |
Vested (in dollars per share) | 181.66 |  |  |
Outstanding at the end of the period (in dollars per share) | $ 150.02 | $ 163.74 |  | $ 150.02
Vesting period of shares |  | 3 years | 3 years |
Restricted Stock Based on Market Conditions [Member] |  |  |  |
Unvested restricted stock |  |  |  |
Outstanding at the beginning of the period (in shares)) | 79,000 |  |  |
Granted (in shares) | 61,997 | 22,931 | 52,191 |
Vested (in shares) | (28,000) |  |  |
Forfeited (in shares) | (28,000) |  |  |
Outstanding at the end of the period (in shares) | 85,000 | 79,000 |  | 85,000
Weighted-Average Grant-Date Fair Value |  |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 91.34 |  |  |
Granted (in dollars per share) | 34.69 |  |  |
Vested (in dollars per share) | 83.35 |  |  |
Forfeited (in dollars per share) | 83.35 |  |  |
Outstanding at the end of the period (in dollars per share) | $ 55.29 | $ 91.34 |  | $ 55.29
Total future compensation cost related to unvested awards that are expected to vest | $ 2.3 |  |  | $ 2.3
Weighted Average Period for Cost recognition | 1 year 7 months 17 days |  |  |
Vesting period of shares |  |  |  | 3 years
Restricted Stock Units |  |  |  |
Unvested restricted stock |  |  |  |
Vested (in shares) | (20,000) |  |  |
Weighted-Average Grant-Date Fair Value |  |  |  |
Vested (in dollars per share) | $ 148.00 |  |  |
Weighted Average Period for Cost recognition | 2 years 3 months 25 days |  |  |
Restricted Stock Units | Executive Officers |  |  |  |
Unvested restricted stock |  |  |  |
Outstanding at the beginning of the period (in shares)) | 31,000 |  |  |
Granted (in shares) | 96,000 |  |  |
Outstanding at the end of the period (in shares) | 107,000 | 31,000 |  | 107,000
Weighted-Average Grant-Date Fair Value |  |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 148.00 |  |  |
Granted (in dollars per share) | 88.27 |  |  |
Outstanding at the end of the period (in dollars per share) | $ 94.26 | $ 148.00 |  | $ 94.26

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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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