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 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation expense $ 8,032 $ 8,963 $ 25,594 $ 31,531
Total unrecognized compensation cost 53,200   $ 53,200  
Amortization period of unrecognized compensation cost (in years)     2 years 3 months  
Selling, general and administrative expenses [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation expense 3,884 4,818 $ 12,654 17,993
Corporate expenses [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation expense $ 4,148 $ 4,145 $ 12,940 $ 13,538