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Stock-Based Compensation (Stock-Based Compensation and Related Tax Benefit) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	3,680
Share-based Payment Arrangement, Expense		$ 3,947,000	$ 3,963,000	$ 2,920,000
Total stock-based compensation		3,947,000	3,963,000	2,920,000
Recognized tax benefit		(818,000)	(832,000)	(613,000)
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense		(12,000)	130,000	156,000
Total stock-based compensation		(12,000)	130,000	156,000
Non-employee directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense		340,000	308,000	345,000
Total stock-based compensation		340,000	308,000	345,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense		3,556,000	3,462,000	2,359,000
Total stock-based compensation		3,556,000	3,462,000	2,359,000
Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense		3,607,000	3,655,000	2,575,000
Total stock-based compensation		3,607,000	$ 3,655,000	2,575,000
Treasury Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation				$ 0
Treasury Stock \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation		275,000
Treasury Stock \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation		$ 120,000