Long-Term Debt (Schedule Of Long-Term Debt) (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Total debt	$ 214,423,000	$ 207,803,000
Less current maturities	417,000	1,093,000
Total long-term debt	214,006,000	206,710,000
Senior Subordinated 6.25% Notes, Due December 1, 2021 [Member]
Debt Instrument [Line Items]
Total debt	210,000,000
Senior Subordinated Notes, interest rate	6.25%
Senior Subordinated 8% Notes, Due December 1, 2015 [Member]
Debt Instrument [Line Items]
Total debt		202,702,000
Senior Subordinated Notes, interest rate	8.00%
Unamortized discount		1,298,000
Other Debt [Member]
Debt Instrument [Line Items]
Total debt	$ 4,423,000	$ 5,101,000