Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION (Summary of stock-based compensation expense) (Details)

v3.6.0.2
STOCK-BASED COMPENSATION (Summary of stock-based compensation expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total stock-based compensation expense $ 32,723 $ 33,361 $ 39,029
Total unrecognized compensation cost $ 31,200    
Amortization period of unrecognized compensation cost 1 year 7 months    
Selling, general, and administrative expenses [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total stock-based compensation expense $ 15,687 16,380 21,204
Corporate expenses [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total stock-based compensation expense $ 17,036 $ 16,981 $ 17,825