Debt (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jan. 01, 2013
Long Term Debt Unclassified [Line Items]
Debt instrument face amount	$ 97,168,000	$ 95,870,000
Proceeds on revolving credit facility	48,300,000	41,800,000	34,650,000
Repayments on revolving credit facility	54,200,000	37,800,000	43,850,000
Percentage charged as unused fee	0.375%
Interest Paid	3,495,000	3,733,000	3,791,000
Rate of cash premium	10.00%
Debt (Textual) [Abstract]
Line of Credit Facility, Current Borrowing Capacity	35,000,000			40,000,000
Repayment of structured note date	Feb. 15, 2012
Spread under prime interest rate on revolving credit facility	0.50%
Secured borrowings [Member]
Long Term Debt Unclassified [Line Items]
Rate of cash premium	10.00%
Junior subordinated notes [Member]
Long Term Debt Unclassified [Line Items]
Period of Line of Credit	90 days
Interest Rate of LIBOR	3.25%
Line of Credit [Member]
Long Term Debt Unclassified [Line Items]
Period of Line of Credit	30 days
Interest Rate of LIBOR	2.00%
Maximum [Member]
Long Term Debt Unclassified [Line Items]
Minimum net worth	134,500,000
Minimum [Member] | Line of Credit [Member]
Long Term Debt Unclassified [Line Items]
Minimum net worth				$ 132,000,000