Income Taxes (Schedule Of Net Deferred Tax Liability) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Current deferred tax asset	$ 23,249	$ 20,054
Noncurrent deferred tax liability	(189,117)	(153,186)
Net deferred tax liability	$ (165,868)	$ (133,132)