Employee Benefit Plans (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Incentive stock options and SARs exercisable period	10 years
Stock awards available to be awarded	407,000
Contributions by employer	$ 450,000	$ 0
Supplemental Unemployment Benefits, Severance Benefits	$ 2,200,000	$ 2,100,000
Maximum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Common stock issued upon the exercise of stock options, SARs and stock awards	750,000
Equity Securities
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	75.00%
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	80.00%
Debt Securities
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	25.00%
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	19.00%
Cash and Cash Equivalents
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	1.00%
Horizon Defined Benefit Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Contributions by employer	$ 0
Anticipated next year plan contributions	$ 1,000,000.0
Community Defined Benefit Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Contributions by employer			$ 1,500,000