Equity Compensation and Employee Benefit Plans (Equity Compensation Expense and Related Income Tax Benefit Recognized) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted Stock
Equity Compensation [Abstract]
Pre-tax compensation expense	$ 5,409	$ 4,943	$ 4,143
Tax benefit	1,379	1,258	1,056
Stock expense, net of tax	4,030	3,685	3,087
Performance Shares
Equity Compensation [Abstract]
Pre-tax compensation expense	3,503	3,156	3,152
Tax benefit	893	803	804
Stock expense, net of tax	$ 2,610	$ 2,353	$ 2,348