Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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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.

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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).

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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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.

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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