Debt with Commercial Bank (Narrative) (Details) (USD $)	9 Months Ended				0 Months Ended	9 Months Ended		0 Months Ended	9 Months Ended	0 Months Ended	9 Months Ended	0 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 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]	Sep. 30, 2013 Secured Syndicated Credit Facility [Member] Revolving Credit Facility [Member] Citi Bank [Member]	Apr. 26, 2012 Credit Agreement, Seventh Amendment [Member] BOA [Member]	Apr. 26, 2012 Secured Term Loan [Member] Secured Syndicated Credit Facility [Member] Citi Bank [Member]	Sep. 30, 2013 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]	Sep. 30, 2013 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			$ 55,000,000	$ 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%	1.68%	2.00%
Deferred Costs, Credit Card Origination Costs, Amount			481,000	744,000
Credit agreement, amount outstanding						22,800,000
Line of credit, interest rate at period end						1.68%
Principal payments of debt obligations	(636,000)	(600,000)				(15,000,000)			(6,500,000)
Credit agreement, average amount outstanding during period						33,300,000
Credit agreement, maximum amount outstanding during period						37,800,000
Long-term Debt									34,300,000
Credit agreement, current amount outstanding									12,700,000
Current maturities, period									12 months
Effective interest rate									1.68%
Long-term Debt, Excluding Current Maturities									$ 21,600,000