Annual report pursuant to Section 13 and 15(d)

CUSTOMER CONTRACTS AND OTHER INTANGIBLE ASSETS (Details)

v3.8.0.1
CUSTOMER CONTRACTS AND OTHER INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-lived intangible assets      
Finite-lived intangible assets, net $ 152,869 $ 117,466  
Other intangible assets      
Other intangible assets, net 61,548 44,310  
Finite and infinite lived intangible assets, net 214,417 161,776  
Non-amortizable, indefinite lived intangible assets 32,200 29,700  
Total amortization expense 29,200 26,200 $ 25,200
Customer contracts      
Finite-lived intangible assets      
Finite-lived intangible assets, gross 290,628 251,194  
Less: Accumulated amortization (137,759) (133,728)  
Finite-lived intangible assets, net $ 152,869 117,466  
Patents      
Schedule of Finite and Indefinite Lived Intangible Assets by Major Class [Line Items]      
Useful life of intangible assets 15 years    
Intangible assets excluding goodwill and customer contracts      
Finite-lived intangible assets      
Less: Accumulated amortization $ (14,232) (12,627)  
Other intangible assets      
Other intangible assets, net 75,780 56,937  
Finite and infinite lived intangible assets, net 61,548 44,310  
Trademarks and trade names      
Other intangible assets      
Finite and infinite lived intangible assets, net 35,000 32,700  
International | Customer contracts      
Finite-lived intangible assets      
Finite-lived intangible assets, net 29,800 29,700  
Other intangible assets      
Finite and infinite lived intangible assets, net $ 3,500 $ 3,800  
Minimum | Customer contracts      
Schedule of Finite and Indefinite Lived Intangible Assets by Major Class [Line Items]      
Useful life of intangible assets 7 years    
Minimum | Non-compete agreements      
Schedule of Finite and Indefinite Lived Intangible Assets by Major Class [Line Items]      
Useful life of intangible assets 3 years    
Maximum | Customer contracts      
Schedule of Finite and Indefinite Lived Intangible Assets by Major Class [Line Items]      
Useful life of intangible assets 20 years    
Maximum | Non-compete agreements      
Schedule of Finite and Indefinite Lived Intangible Assets by Major Class [Line Items]      
Useful life of intangible assets 20 years