Stock Based Compensation - Exercise Price Range (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of Options, Outstanding and Exercisable (in shares)	107,500	215,345	118,003
Weighted Average Remaining Contractual Life (In Years)	2 years 3 days
Weighted Average Exercise Price, Outstanding and Exercisable (in dollars per share)	$ 19.64	$ 12.27	$ 19.90
$0.00 – $10.00
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Range of price, lower range limit (in dollars per share)	0.00
Range of price, upper range limit (in dollars per share)	$ 10.00
Number of Options, Outstanding and Exercisable (in shares)	2,500
Weighted Average Remaining Contractual Life (In Years)	2 years 5 months 12 days
Weighted Average Exercise Price, Outstanding and Exercisable (in dollars per share)	$ 9.00
$10.01 – $20.00
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Range of price, lower range limit (in dollars per share)	10.01
Range of price, upper range limit (in dollars per share)	$ 20.00
Number of Options, Outstanding and Exercisable (in shares)	97,500
Weighted Average Remaining Contractual Life (In Years)	2 years 21 days
Weighted Average Exercise Price, Outstanding and Exercisable (in dollars per share)	$ 19.32
$20.01 – $30.00
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Range of price, lower range limit (in dollars per share)	20.01
Range of price, upper range limit (in dollars per share)	$ 30.00
Number of Options, Outstanding and Exercisable (in shares)	2,500
Weighted Average Remaining Contractual Life (In Years)	1 year 5 months 4 days
Weighted Average Exercise Price, Outstanding and Exercisable (in dollars per share)	$ 21.80
$30.01 – $40.00
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Range of price, lower range limit (in dollars per share)	30.01
Range of price, upper range limit (in dollars per share)	$ 40.00
Number of Options, Outstanding and Exercisable (in shares)	5,000
Weighted Average Remaining Contractual Life (In Years)	1 year 2 months 8 days
Weighted Average Exercise Price, Outstanding and Exercisable (in dollars per share)	$ 30.20