Disclosures About Fair Value of Financial Instruments (Details) Narrative (Fair Value, Measurements, Recurring, Continuing Operations, USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available-for-sale securities	$ 40,438	[1]	$ 27,901	[1]
Significant Other Observable Inputs (Level 2) | OTC Bulletin Board
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available-for-sale securities	$ 12,461	[1]	$ 13,705	[1]

[1] Where there are quoted market prices that are readily available in an active market, securities are classified as Level 1 of the valuation hierarchy. Level 1 available-for-sale investments are valued using quoted market prices multiplied by the number of shares owned and debt securities are valued using a market quote in an active market. All Level 2 available-for-sale securities are one class because they all contain similar risks and are valued using market prices and include securities where the markets are not active, that is where there are few transactions, or the prices are not current or the prices vary considerably over time. Inputs include directly or indirectly observable inputs such as quoted prices. Level 3 available-for-sale securities would include securities where valuation is based on unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets. This includes certain pricing models, discounted cash flow methodologies and similar techniques that use significant unobservable inputs.