Note 3. Long-Term Debt and Other Financial Instruments (Details) - Carrying values and estimated fair values of the Company's financial instruments: (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Investments
Trading	$ 236	$ 198
Trading	236	198
Carrying amount	588,393	553,187
Term Loan [Member]
Investments
Carrying amount	261,934	257,466
Fair value	345,260	343,746
Senior Notes [Member]
Investments
Carrying amount	296,454	295,709
Fair value	327,906	346,269
Revolving Credit Facility [Member]
Investments
Revolving credit facility ($15 million remaining availability at 9/30/13)	$ 30,000