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COMMITMENTS, CONTINGENCIES AND REGULATORY MATTERS (Details 2)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
letter_of_credit
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Operating Lease Obligations      
Total operating lease expense, net of sublease income $ 19,000 $ 17,600 $ 20,000
Sublease income 1,300 $ 500 $ 100
Future minimum payments due, sublease rentals 2,900    
Operating lease obligations      
2018 19,833    
2019 14,012    
2020 10,222    
2021 6,817    
2022 2,676    
Thereafter 230    
Operating lease obligations $ 53,790    
Financial Standby Letter of Credit      
Operating Lease Obligations      
Standby letters of credit, number | letter_of_credit 4    
Standby letter of credit, amount $ 1,500    
Minimum      
Operating Lease Obligations      
Customary lease term 0 years    
Maximum      
Operating Lease Obligations      
Customary lease term 9 years