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INCOME TAXES (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Income Tax Disclosure [Abstract]        
Withholding tax rate for royalty payments     16.50%  
Effective income tax rate, percent 29.60% 29.80% 31.80% 28.90%
Income tax expense $ 8,588 $ 6,517 $ 11,395 $ 4,323