Disclosures About Fair Value of Financial Instruments (Details) Carrying Values and Estimated Fair Values (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financial liabilities:
Debt	$ 136,767	$ 141,008
Carrying Amount
Fair Value of Financial Instruments
Cost Method Investments, Fair Value Disclosure	19,380	2,060
Equity Method Investments, Fair Value Disclosure	8,697
Financial liabilities:
Debt	136,767	141,008
Estimated Fair Value
Fair Value of Financial Instruments
Cost Method Investments, Fair Value Disclosure	19,380	2,060
Equity Method Investments, Fair Value Disclosure	8,697
Financial liabilities:
Debt	$ 145,924	$ 137,024