Long-Term Debt (Schedule Of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Debt Disclosure [Abstract]
Senior Notes	$ 227,143	$ 262,857
Revolving credit facility	10,000	0
Capitalized lease and other obligations	3,264	6,328
Total long-term debt	240,407	269,185
Less: Current maturities	(38,978)	(39,354)
Total maturities due after one year	$ 201,429	$ 229,831