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COMMITMENTS, CONTINGENCIES AND REGULATORY MATTERS (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating Lease Obligations      
Total operating lease expense, net of sublease income $ 17,600 $ 20,000 $ 20,100
Future minimum payments due, sublease rentals 3,100    
Operating lease obligations      
2017 17,857    
2018 13,560    
2019 10,706    
2020 7,406    
2021 5,469    
Thereafter 1,154    
Operating lease obligations 56,152    
Financial Standby Letter of Credit      
Operating Lease Obligations      
Standby letter of credit $ 2,100    
Minimum      
Operating Lease Obligations      
Customary lease term 1 year    
Maximum      
Operating Lease Obligations      
Customary lease term 9 years