Commercial Bank Financing Facility (Details) (USD $)	12 Months Ended					12 Months Ended			0 Months Ended	12 Months Ended			12 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Secured Syndicated Credit Facility [Member] Citi Bank [Member]	Apr. 26, 2012 Secured Syndicated Credit Facility [Member] Citi Bank [Member]	Dec. 31, 2013 Secured Syndicated Credit Facility [Member] Revolving Credit Facility [Member] Citi Bank [Member]	Dec. 31, 2012 Secured Syndicated Credit Facility [Member] Revolving Credit Facility [Member] Citi Bank [Member]	Apr. 26, 2012 Secured Syndicated Credit Facility [Member] Revolving Credit Facility [Member] Citi Bank [Member]	Apr. 26, 2012 Credit Agreement, Seventh Amendment [Member] BOA [Member]	Dec. 31, 2013 Secured Term Loan [Member] Secured Syndicated Credit Facility [Member] Citi Bank [Member]	Dec. 31, 2012 Secured Term Loan [Member] Secured Syndicated Credit Facility [Member] Citi Bank [Member]	Apr. 26, 2012 Secured Term Loan [Member] Secured Syndicated Credit Facility [Member] Citi Bank [Member]	Dec. 31, 2013 Minimum [Member] Secured Syndicated Credit Facility [Member] Citi Bank [Member]	Dec. 31, 2013 Mid-range [Member] Secured Syndicated Credit Facility [Member] Citi Bank [Member]	Dec. 31, 2013 Maximum [Member] Secured Syndicated Credit Facility [Member] Citi Bank [Member]
Line of Credit Facility [Line Items]
Debt instrument, face amount					$ 100,000,000				$ 55,000,000			$ 45,000,000
Revolving credit facility, term						4 years
Credit agreement, maximum borrowing capacity								45,000,000
Credit agreement, amortization period										4 years
Line of Credit Facility, Expansion								10,000,000
Basis spread on variable interest rate													1.50%		2.00%
Debt Instrument, Interest Rate at Period End														1.67%
Deferred Costs, Credit Card Origination Costs, Amount				434,000	744,000
Repayments of term loan	665,000	600,000	0						45,140,000	8,900,000
Credit agreement, amount outstanding						22,800,000	37,800,000
Line of credit, interest rate at period end						1.67%
Credit agreement, average amount outstanding during period						30,700,000
Credit agreement, maximum amount outstanding during period						37,800,000
Debt, Weighted Average Interest Rate						1.69%	1.71%
Long-term Debt	56,669,000									31,900,000	40,900,000
Credit agreement, current amount outstanding										$ 13,100,000
Current maturities, period										12 months
Effective interest rate										1.67%