STOCK-BASED COMPENSATION Restricted stock (Details) (Restricted stock, USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance and service conditions (1) (2)	566,830	[1]
Vest 50% on each of the second and third anniversaries of the grant date with service conditions only	35,000
Immediately vested	1,400
Vest two-thirds on the second anniversary of the grant date and one-third on the third anniversary of the grant date with service conditions only	20,000
Vest one-third on each of the first three anniversaries of the grant date with service conditions only	15,000
Total shares of restricted stock granted for the year ended December 31, 2012	638,230
Fifty percent of the shares of restricted stock may be earned on the basis of performance	50.00%
Twenty five percent of the shares of restricted stock may be earned on the basis of performance as measured by an employee engagement score	25.00%
Twenty five percent of the shares of restricted stock may be earned on the basis of performance as measured by Cash Efficiency	25.00%
Thirty three percent of the shares vest on the later of the first anniversary of the grant date or the determination that the performance conditions have been satisfied	33.00%
Thirty three percent of the shares vest on the second anniversary of the grant date	33.00%
Thirty four percent of the shares vest on the third anniversary of the grant date	34.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Non-vested restricted stock (units) at January 1, weighted average grant date fair value	$ 5.12		$ 3.64	$ 2.70
Granted, weighted average grant date fair value	$ 4.59		$ 6.22	$ 4.56
Vested, weighted average grant date fair value	$ 4.86		$ 4.09	$ 4.33
Forfeited, weighted average grant date fair value	$ 5.26		$ 3.86	$ 3.19
Non-vested restricted stock (units) at December 31, weighted average grant date fair value	$ 4.87		$ 5.12	$ 3.64
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested restricted stock (units) at January 1, number of shares of restricted stock (unit)	1,166,082		953,037	531,083
Granted, number of share of restricted stock (units)	638,230		743,625	597,732
Vested, number of share of restricted stock (units)	(461,200)		(295,065)	(111,112)
Forfeited, number of share of restricted stock	(314,196)		(235,515)	(64,666)
Unvested restricted stock (units) at December 31, number of shares of restricted stock (unit)	1,028,916		1,166,082	953,037
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value	$ 2,239		$ 1,207	$ 481

[1] (1)The performance conditions with respect to restricted stock may be satisfied as follows: (a)50% of the shares of restricted stock may be earned on the basis of performance as measured by a “Take-out Ratio,” defined as the percentage of the direct, front line costs incurred for the year ended December 31, 2012 divided by the gross margin for the year ended December 31, 2012;(b)25% of the shares of restricted stock may be earned on the basis of performance as measured by an employee engagement score for the year ended December 31, 2012 based on an employee survey conducted by a global human resources consulting firm; and(c)25% of the shares of restricted stock may be earned on the basis of performance as measured by “Cash Efficiency,” defined as (1) cash flow from operations for the year ended December 31, 2012 divided by (2) gross margin minus selling, general and administrative expenses for the year ended December 31, 2012.(2)To the extent shares are earned on the basis of performance, such shares will vest on the basis of service as follows:(a)33% of the shares vest on the later of the first anniversary of the grant date or the determination that the performance conditions have been satisfied;(b)33% of the shares vest on the second anniversary of the grant date; and(c)34% of the shares vest on the third anniversary of the grant date; provided that, in each case, the named executive officer remains employed by the Company from the grant date through the applicable service