Stock-Based And Long-Term Compensation (Summary Of Compensation Expense and Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Compensation expense	$ 45,572	$ 44,074	$ 35,060
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	12,055	11,463	9,267
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Compensation expense	3,663	3,900	3,586
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	1,355	1,443	1,327
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Compensation expense	9,219	15,800	21,460
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	3,411	5,846	7,940
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Compensation expense	19,699	11,282
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	7,289	4,174
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Compensation expense	10,733	10,688	10,014
2013 Employee Stock Purchase Plan Member
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Compensation expense	$ 835	$ 1,078	$ 947