Share-Based Compensation - Option Price Ranges (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options Outstanding, Number Outstanding (in shares)	219,000
Options Outstanding, Weighted-Average Remaining Contractual Life (Years)	2 years 9 months 18 days	2 years 6 months 25 days	2 years 7 months 6 days	3 years 18 days
Options Outstanding, Weighted-Average Exercise Price (in dollars per share)	$ 42.38
Options Exercisable, Number of Shares	114,000
Options Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 47.43
$30.40 Exercise Price Range
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Shares authorized under stock option plans, exercise price range, lower range limit	30.4
Shares authorized under stock option plans, exercise price range, upper range limit	$ 30.4
Options Outstanding, Number Outstanding (in shares)	42,000
Options Outstanding, Weighted-Average Remaining Contractual Life (Years)	11 months 8 days
Options Outstanding, Weighted-Average Exercise Price (in dollars per share)	$ 5.83
Options Exercisable, Number of Shares	0
Options Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 0
$35.70 Exercise Price Range
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Shares authorized under stock option plans, exercise price range, lower range limit	35.7
Shares authorized under stock option plans, exercise price range, upper range limit	$ 35.7
Options Outstanding, Number Outstanding (in shares)	36,000
Options Outstanding, Weighted-Average Remaining Contractual Life (Years)	7 months 24 days
Options Outstanding, Weighted-Average Exercise Price (in dollars per share)	$ 5.87
Options Exercisable, Number of Shares	9,000
Options Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 2.82
$41.60 Exercise Price Range
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Shares authorized under stock option plans, exercise price range, lower range limit	41.6
Shares authorized under stock option plans, exercise price range, upper range limit	$ 41.6
Options Outstanding, Number Outstanding (in shares)	36,000
Options Outstanding, Weighted-Average Remaining Contractual Life (Years)	5 months 12 days
Options Outstanding, Weighted-Average Exercise Price (in dollars per share)	$ 6.84
Options Exercisable, Number of Shares	20,250
Options Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 7.39
$42.56 Exercise Price Range
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Shares authorized under stock option plans, exercise price range, lower range limit	42.56
Shares authorized under stock option plans, exercise price range, upper range limit	$ 42.56
Options Outstanding, Number Outstanding (in shares)	36,000
Options Outstanding, Weighted-Average Remaining Contractual Life (Years)	3 months 29 days
Options Outstanding, Weighted-Average Exercise Price (in dollars per share)	$ 6.99
Options Exercisable, Number of Shares	27,000
Options Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 10.08
$52.92 Exercise Price Range
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Shares authorized under stock option plans, exercise price range, lower range limit	52.92
Shares authorized under stock option plans, exercise price range, upper range limit	$ 52.92
Options Outstanding, Number Outstanding (in shares)	30,000
Options Outstanding, Weighted-Average Remaining Contractual Life (Years)	3 months 29 days
Options Outstanding, Weighted-Average Exercise Price (in dollars per share)	$ 7.25
Options Exercisable, Number of Shares	18,750
Options Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 8.70
$53.90 Exercise Price Range
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Shares authorized under stock option plans, exercise price range, lower range limit	53.9
Shares authorized under stock option plans, exercise price range, upper range limit	$ 53.9
Options Outstanding, Number Outstanding (in shares)	39,000
Options Outstanding, Weighted-Average Remaining Contractual Life (Years)	1 month 2 days
Options Outstanding, Weighted-Average Exercise Price (in dollars per share)	$ 9.60
Options Exercisable, Number of Shares	39,000
Options Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 18.44