Stock-Based Compensation (Schedule Of Unrecognized Compensation Cost And Remaining Weighted-Average Amortization Period) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 5,824
Remaining weighted-average amortization period	2 years 4 months 24 days
Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	1,795
Remaining weighted-average amortization period	1 year 7 months 6 days
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	7,359
Remaining weighted-average amortization period	3 years 2 months 12 days
Performance Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 2,543
Remaining weighted-average amortization period	2 years 4 months 24 days