Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION Stock-Based Compensation (Details)

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STOCK-BASED COMPENSATION Stock-Based Compensation (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation expense $ 8,065 $ 12,550 $ 17,562 $ 22,568
Total unrecognized compensation cost 61,200   $ 61,200  
Amortization period of unrecognized compensation cost (in years)     2 years 5 months 7 days  
Selling, general and administrative expenses [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation expense 4,028 8,255 $ 8,770 13,175
Corporate expenses [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation expense $ 4,037 $ 4,295 $ 8,792 $ 9,393