Stock-Based Compensation (Activity in the Stock Plan) (Details) - shares	1 Months Ended	3 Months Ended	99 Months Ended	147 Months Ended
	May 31, 2014	Mar. 31, 2017	Mar. 31, 2017	Mar. 31, 2017
Employee Stock Award Plan-2008
Authorized Shares Available for Future Award Grants
Beginning balance (in shares)		1,248,651	1,900,000
Additional shares authorized (in shares)	1,500,000	0	1,500,000
Number of awards granted (in shares)		(253,895)	(2,866,461)
Number of awards forfeited or expired (in shares)		3,228	464,445
Ending balance (in shares)		997,984	997,984	997,984
Employee Stock Award Plan-2008 | Options Awards
Authorized Shares Available for Future Award Grants
Number of option awards exercised (in shares)		45,037	994,105
Employee Stock Award Plan-2008 | Unrestricted Stock Awards
Authorized Shares Available for Future Award Grants
Number of awards granted (in shares)		0	(7,325)
Employee Stock Award Plan-2008 | Restricted Stock Awards
Authorized Shares Available for Future Award Grants
Number of restricted stock awards vested (in shares)		0	36,970
Director Plan - 2005
Authorized Shares Available for Future Award Grants
Beginning balance (in shares)		74,771		300,000
Number of awards granted (in shares)		0		(249,232)
Number of awards forfeited or expired (in shares)		0		24,003
Ending balance (in shares)		74,771	74,771	74,771
Director Plan - 2005 | Options Awards
Authorized Shares Available for Future Award Grants
Number of option awards exercised (in shares)		1,727		54,200
Number of restricted stock awards vested (in shares)		0		31,556