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COMMITMENTS AND CONTINGENCIES - Operating Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Future minimum lease payments, Other Operating Leases      
2016 $ 15,347    
2017 11,334    
2018 9,372    
2019 5,371    
2020 1,239    
Total future minimum lease payments 42,663    
Rental expense 11,700 $ 4,700 $ 5,100
Affiliate      
Future minimum lease payments, Other Operating Leases      
2016 240    
Total future minimum lease payments 240    
Others      
Future minimum lease payments, Other Operating Leases      
2016 15,107    
2017 11,334    
2018 9,372    
2019 5,371    
2020 1,239    
Total future minimum lease payments $ 42,423