BORROWINGS (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended			1 Months Ended	3 Months Ended		6 Months Ended			1 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Mar. 31, 2013 Equipment under capital leases	Jun. 30, 2013 Equipment under capital leases	Jun. 30, 2012 Equipment under capital leases	Jun. 30, 2013 Equipment under capital leases	Jun. 30, 2012 Equipment under capital leases	Dec. 31, 2012 Equipment under capital leases	Dec. 31, 2012 Credit Agreement	Jun. 30, 2013 Credit Agreement	Jun. 30, 2013 Financing Agreement	Dec. 31, 2012 Financing Agreement	Jun. 30, 2013 Purchasing Card	Dec. 31, 2012 Purchasing Card
Borrowings
Maximum borrowing capacity														$ 3,000,000	$ 3,000,000		$ 20,000,000
Variable rate basis														one-month LIBOR	one-month LIBOR
Interest rate margin on variable rate basis (as a percent)														1.00%	1.00%
Amounts outstanding														0	0	0	0
Letters of credit, outstanding amount	1,800,000		1,800,000		1,800,000		1,800,000
Outstanding balance																		2,900,000	3,900,000
Unused borrowing capacity																		2,100,000	1,100,000
Computer equipment acquired under capital lease obligations			2,563,000		2,563,000	1,391,000		2,600,000
Payment of capital lease obligation			2,563,000	112,000	2,563,000	274,000		2,600,000
Future payment obligations under capital leases	0		0		0
Fixed assets under capital leases									4,200,000		4,200,000		1,700,000
Accumulated depreciation									1,800,000		1,800,000		1,700,000
Depreciation and amortization	$ 3,663,000	$ 4,062,000	$ 7,526,000	$ 8,096,000	$ 15,439,000	$ 16,183,000			$ 107,000	$ 90,000	$ 108,000	$ 220,000