Stock-Based Compensation (Additional Information For RSU's Under The 2007 Plan) (Details) (2007 Incentive Plan [Member], Restricted Stock Units (RSUs) [Member]) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
2007 Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]
Number of Shares [Roll Forward]
Restricted Stock Units outstanding, beginning balance	495	404	359
Granted, Shares	260	196	149
Released, Shares	(140)	(91)	(95)
Forfeited, Shares	(10)	(14)	(9)
Restricted Stock Units outstanding, ending balance	605	495	404
Expected to vest, shares	551	438	343