Long-Term Debt - Summary of Maturities of Long-Term Debt (Details) (USD $)	Dec. 31, 2012		Dec. 31, 2011
Debt Disclosure [Abstract]
2013	$ 0
2014	10,000,000
2015	0
2016	0
Later Years	10,000,000	[1]
Total long-term debt	$ 20,000,000		$ 22,000,000

[1] Fixed rate advances with convertible options