Stock-Based Compensation (Additional Information For RSU's Under The 2007 Plan) (Details) - 2007 and 2012 Incentive Plan [Member] - Restricted Stock Units (RSUs) [Member] - shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Number of Shares [Roll Forward]
Restricted Stock Units outstanding, beginning balance (in shares)	725,000	733,000	605,000
Granted (in shares)	248,000	189,000	301,000
Released (in shares)	(212,000)	(189,000)	(152,000)
Forfeited (in shares)	(11,000)	(8,000)	(21,000)
Restricted Stock Units outstanding, ending balance (in shares)	750,000	725,000	733,000
Expected to vest (in shares)	731,000	691,000	683,000