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Stock-Based Compensation (Activity in the Stock Plan) (Details) - shares	1 Months Ended	3 Months Ended	147 Months Ended	195 Months Ended
	May 31, 2014	Mar. 31, 2021	Mar. 31, 2021	Mar. 31, 2021
Employee Stock Award Plan-2008
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward]
Beginning balance (in shares)		700,680	1,900,000
Additional shares authorized (in shares)	1,500,000	0	1,500,000
Number of awards granted (in shares)		(153,260)	(3,442,159)
Number of awards forfeited or expired (in shares)		32,169	621,748
Ending balance (in shares)		579,589	579,589	579,589
Employee Stock Award Plan-2008 | Options Awards
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward]
Number of option awards exercised (in shares)		4,500	1,478,589
Employee Stock Award Plan-2008 | Unrestricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward]
Number of awards granted (in shares)		0	(10,090)
Employee Stock Award Plan-2008 | Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward]
Number of restricted stock awards vested (in shares)		51,902	216,280
Director Plan - 2005
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward]
Beginning balance (in shares)		160,135		300,000
Additional shares authorized (in shares)		0		150,000
Number of awards granted (in shares)		0		(313,868)
Number of awards forfeited or expired (in shares)		2,727		26,730
Ending balance (in shares)		162,862	162,862	162,862
Director Plan - 2005 | Options Awards
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward]
Number of option awards exercised (in shares)		8,181		142,001
Director Plan - 2005 | Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward]
Number of restricted stock awards vested (in shares)		0		98,491

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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