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COMMITMENTS AND CONTINGENCIES - Operating Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating Leases      
Rent expense from continuing operations under leases $ 26,000 $ 21,700 $ 19,400
Future minimum payments under the leases      
2017 22,627    
2018 22,267    
2019 20,899    
2020 20,177    
2021 18,752    
2022 and thereafter 92,019    
Total $ 196,741    
Minimum      
Operating Leases      
Operating leases term 1 year    
Maximum      
Operating Leases      
Operating leases term 40 years