STOCK PLANS (Details 2) (USD $)	3 Months Ended		9 Months Ended				9 Months Ended		0 Months Ended			9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Restricted stock awards	Dec. 31, 2012 Restricted stock awards	Sep. 30, 2013 Restricted Stock Units	Sep. 30, 2013 2013 LTIP	Feb. 21, 2013 2013 LTIP Performance stock awards	Feb. 21, 2013 2013 LTIP Performance stock awards Minimum	Feb. 21, 2013 2013 LTIP Performance stock awards Maximum	Sep. 30, 2013 Cash-based 2013 LTIP
Stock-based compensation
Aggregate grant date fair value of awards							$ 400,000
Future compensation cost related to the nonvested portion of the restricted stock awards not yet recognized					6,500,000
Period over which future compensation cost expected to be recognized					2 years 5 months 23 days
Vesting period					4 years
Nonvested Outstanding
Nonvested Awards at the beginning of the period (in shares)					758,103
Awards granted (in shares)					338,801		24,779
Awards vested (in shares)					(236,526)
Awards cancelled (in shares)					(90,138)
Nonvested Awards at the end of the period (in shares)					770,240
Weighted Average Grant Date Fair Value
Nonvested Awards at the beginning of the period (in dollars per share)					$ 11.00
Awards granted (in dollars per share)					$ 14.86
Awards vested (in dollars per share)					$ 10.02
Awards cancelled (in dollars per share)					$ 12.79
Nonvested Awards at the end of the period (in dollars per share)					$ 12.79
Aggregate Intrinsic Value
Nonvested Awards at the end of the period					9,851,370	8,339,133
Payout level based on incentive target (as a percent)										0.00%	200.00%
Maximum number of shares to be issued									883,262
Cash payout										0	3,170,000
Number of shares to be issued as performance stock awards										0
Vesting percentage									100.00%
Share-based compensation expense recognized	$ 2,525,000	$ 2,477,000	$ 6,229,000	$ 6,208,000				$ 800,000				$ 400,000