Debt with Commercial Bank (Narrative) (Details) (USD $)	3 Months Ended				0 Months Ended	3 Months Ended	0 Months Ended	3 Months Ended	0 Months Ended	3 Months Ended	0 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Secured Syndicated Credit Facility [Member] Citi Bank [Member]	Apr. 26, 2012 Secured Syndicated Credit Facility [Member] Citi Bank [Member]	Apr. 26, 2012 Secured Syndicated Credit Facility [Member] Revolving Credit Facility [Member] Citi Bank [Member]	Mar. 31, 2014 Secured Syndicated Credit Facility [Member] Revolving Credit Facility [Member] Citi Bank [Member]	Apr. 26, 2012 Secured Term Loan [Member] Secured Syndicated Credit Facility [Member] Citi Bank [Member]	Mar. 31, 2014 Secured Term Loan [Member] Secured Syndicated Credit Facility [Member] Citi Bank [Member]	Apr. 26, 2012 Minimum [Member] Secured Syndicated Credit Facility [Member] Citi Bank [Member]	Mar. 31, 2014 Mid-range [Member] Secured Syndicated Credit Facility [Member] Citi Bank [Member]	Apr. 26, 2012 Maximum [Member] Secured Syndicated Credit Facility [Member] Citi Bank [Member]
Line of Credit Facility [Line Items]
Debt instrument, face amount				$ 100,000,000			$ 45,000,000
Line of 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
Description of variable interest rate basis			LIBOR
Basis spread on variable interest rate									1.50%	1.65%	2.00%
Deferred Costs, Credit Card Origination Costs, Amount			388,000	744,000
Credit agreement, amount outstanding						22,800,000
Line of credit, interest rate at period end						1.65%
Principal payments of debt obligations	(9,000)	(12,000)				0		(2,400,000)
Credit agreement, average amount outstanding during period						22,800,000
Credit agreement, maximum amount outstanding during period						22,800,000
Long-term Debt								29,500,000
Credit agreement, current amount outstanding								13,400,000
Current maturities, period								12 months
Effective interest rate								1.65%
Long-term Debt, Excluding Current Maturities								$ 16,100,000