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GOODWILL AND OTHER INTANGIBLE ASSETS Intangible assets included in Other assets and intangibles (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Finite-lived intangible assets, accumulated amortization $ 656,719 $ 563,892
Total intangible assets, gross 1,225,834 1,150,018
Total intangible assets, net 569,115 586,126
Customer lists and relationships [Member]    
Finite-lived intangible assets, gross 430,026 424,405
Finite-lived intangible assets, accumulated amortization 195,842 175,112
Finite-lived intangible assets, net 234,184 249,293
Trademarks, trade names and other [Member]    
Finite-lived intangible assets, gross 25,886 25,353
Finite-lived intangible assets, accumulated amortization 16,054 14,262
Finite-lived intangible assets, net 9,832 11,091
Non-amortized trade names and other [Member]    
Indefinite-lived intangible assets, carrying amount 137,491 128,282
Capitalized software [Member]    
Finite-lived intangible assets, gross 632,431 571,978
Finite-lived intangible assets, accumulated amortization 444,823 374,518
Finite-lived intangible assets, net $ 187,608 $ 197,460
Weighted average [Member]    
Finite-lived intangible assets, useful life 8 years 2 months  
Weighted average [Member] | Customer lists and relationships [Member]    
Finite-lived intangible assets, useful life 13 years 9 months 18 days  
Weighted average [Member] | Trademarks, trade names and other [Member]    
Finite-lived intangible assets, useful life 13 years 5 months 18 days  
Weighted average [Member] | Capitalized software [Member]    
Finite-lived intangible assets, useful life 4 years 1 month 12 days