Stock Based Compensation Stock Based Compensation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	2,250,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	642,487
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	$ 15,300,000	$ 8,400,000	$ 14,500,000
Share-based Payment Arrangement, Expense	4,600,000	$ 3,900,000	$ 3,600,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 11,000,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	2 years 1 month 6 days
Restricted Stock Units Awarded Under the 2018 LTIP Plan	20,370
Non-employee Director Restricted Stock Units Awarded	2,910
Stock Units Awarded Under the 2018 LTIP Plan		24,000	24,000
Value of Stock Units Awarded Under the 2018 LTIP Plan	$ 933,000	$ 652,000	$ 680,000
Total Numbner of Units Outstanding Under the 2006 Director Equity Plan	8,059
Value of Units Outstanding Under the 2006 Director Equity Plan	$ 200,000
Stock or Unit Option Plan Expense	$ (300,000)	(400,000)	(200,000)
Total Stock Units Outstanding Under All Stock Option Plans	47,874
Total Value of Units Outstanding Under All Stock Option Plans	$ 1,400,000
Deferred Compensation Equity	3,000,000
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits	1,400,000
Deferred Compensation Liability, Current and Noncurrent	$ 300,000	$ 200,000	$ 200,000