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Stock-Based Compensation (Stock-Based Compensation and Related Tax Benefit) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	3,200
Share-based Payment Arrangement, Expense		$ 3,963,000	$ 2,920,000	$ 2,124,000
Total stock-based compensation		3,963,000	2,920,000	2,124,000
Recognized tax benefit		(832,000)	(613,000)	(446,000)
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense		3,462,000	2,359,000	1,747,000
Total stock-based compensation		3,462,000	2,359,000	1,747,000
Non-employee directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense		308,000	345,000	322,000
Total stock-based compensation		308,000	345,000	322,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense		130,000	156,000	0
Total stock-based compensation		130,000	156,000	0
Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense		3,655,000	2,575,000	1,802,000
Total stock-based compensation		3,655,000	$ 2,575,000	1,802,000
Treasury Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation				$ 0
Treasury Stock \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation		$ 102,400