Annual report pursuant to Section 13 and 15(d)

NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES (Details 5)

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NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES (Details 5)
12 Months Ended
Dec. 31, 2012
Time-based stock options | Maximum
 
Share-based Compensation  
Vesting period 48 months
Performance based stock options
 
Share-based Compensation  
Vesting period 2 years
Operating income margin, one (as a percent) 6.00%
Operating income margin, two (as a percent) 8.00%
Operating income margin, three (as a percent) 10.00%
Period of time during which operating income margins must be achieved in order to vest in performance based stock options 12 months
Consecutive period of time used to assess operating income margins which determine vesting 15 months