Debt and Capital Lease Obligations (Details) (USD $)			12 Months Ended			0 Months Ended	12 Months Ended								12 Months Ended					12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Term Loan [Member]	Dec. 31, 2011 Term Loan [Member]	Dec. 31, 2012 Term Loan [Member] Maximum [Member]	May 02, 2011 Line of Credit [Member]	Dec. 31, 2012 Line of Credit [Member]	Dec. 31, 2011 Line of Credit [Member]	Dec. 31, 2010 Line of Credit [Member]	Dec. 31, 2012 Line of Credit [Member] Minimum [Member]	Dec. 31, 2012 Line of Credit [Member] Maximum [Member]	Dec. 31, 2012 Letter of Credit [Member]	Dec. 31, 2012 Letter of Credit [Member] Minimum [Member]	Dec. 31, 2012 Letter of Credit [Member] Maximum [Member]	Dec. 31, 2012 Promissory Notes [Member]	Dec. 31, 2011 Promissory Notes [Member]	Jun. 30, 2010 Promissory Notes [Member]	Dec. 31, 2012 Premium on Promissory Notes [Member]	Dec. 31, 2011 Premium on Promissory Notes [Member]	Dec. 31, 2012 Note With Affiliated Party [Member]	Dec. 31, 2011 Note With Affiliated Party [Member]	Dec. 31, 2012 Capital Lease Obligations [Member]	Dec. 31, 2011 Capital Lease Obligations [Member]
Long-term debt and capital lease obligations [Abstract]
Long-term debt and capital lease obligations	$ 13,082,000	$ 13,784,000	$ 11,822,000	$ 12,240,000			$ 0	$ 0							$ 600,000	$ 600,000		$ 298,000	$ 404,000	$ 346,000	$ 519,000	$ 16,000	$ 21,000
Less current portion	642,000	596,000
Long-term debt and capital lease obligations, net of current portion	12,440,000	13,188,000
Maturity date			Jul. 01, 2018				Sep. 30, 2015								Jul. 01, 2015					Nov. 15, 2014
Maturities of Long-term Debt [Abstract]
2013			456,000												0					181,000		6,000
2014			486,000												0					165,000		5,000
2015			516,000												600,000					0		5,000
2016			549,000												0					0		1,000
2017			588,000												0					0		0
Thereafter			9,227,000												0					0		0
Long-term Debt			11,822,000												600,000					346,000		17,000
Amount representing interest			0												0					0		1,000
Term Loan and Line of Credit [Abstract]
Maximum borrowing capacity							22,000,000					2,500,000
Balance of term loan							11,800,000
Proceeds from sale of equity method investments						15,300,000
Basis Spread on Variable Rate (in hundredth)							1.00%			1.00%	2.25%		1.00%	2.00%
Unused debt instrument commitment fee (in hundredth)							0.15%			0.15%	0.30%
Unused debt instrument commitment fee							34,000	29,000	29,000
Interest rate at period end (in hundredths)			1.21%
Ratio of Indebtedness to net capital					3.0
Fixed charge coverage ratio, Minimum (in hundredths)			1.25
Promissory Notes Payable to Individual Lenders [Abstract]
Number of individuals with executed promissory notes	3
Stated interest rate (in hundredths)															27.80%		24.00%			4.75%
Effective interest rate (in hundredths)															6.31%
Notes With Affiliated Party [Abstract]
Frequency of periodic payment																				monthly
Monthly loan payments																				$ 16,129