BORROWINGS (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended			1 Months Ended	3 Months Ended		9 Months Ended					9 Months Ended	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Mar. 31, 2013 Equipment under capital leases	Sep. 30, 2013 Equipment under capital leases	Sep. 30, 2012 Equipment under capital leases	Sep. 30, 2013 Equipment under capital leases	Sep. 30, 2012 Equipment under capital leases	Dec. 31, 2012 Equipment under capital leases	Sep. 30, 2013 Cash-collateralized line of credit agreement	Dec. 31, 2012 Cash-collateralized line of credit agreement	Sep. 30, 2013 Cash-collateralized line of credit agreement One-month LIBOR	Dec. 31, 2012 Cash-collateralized line of credit agreement One-month LIBOR	Sep. 30, 2013 Revolving credit facility	Dec. 31, 2012 Revolving credit facility	Sep. 30, 2013 Commercial purchasing card	Dec. 31, 2012 Commercial purchasing card
Debt Instrument [Line Items]
Maximum borrowing capacity														$ 3,000,000	$ 3,000,000				$ 20,000,000
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																				900,000	3,900,000
Unused borrowing capacity																				4,100,000	1,100,000
Computer equipment acquired under capital lease obligations			2,563,000	0	2,563,000	0		2,600,000
Payment of capital lease obligation			2,563,000	112,000	2,563,000	188,000		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									1,900,000		1,900,000		1,700,000
Depreciation and amortization	$ 3,307,000	$ 3,839,000	$ 10,833,000	$ 11,935,000	$ 14,907,000	$ 15,813,000			$ 161,000	$ 1,000	$ 268,000	$ 221,000