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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Intangible Assets, Segment Reporting, Insurance Reserves and Capitalized Interest (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
item
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Segment Reporting      
Number of operating segments | item 2    
Number of reportable segments | item 1    
Self-insurance Reserves      
Period for reviewing actual expenditure to determine self-insurance reserve 12 months    
Capitalized Interest      
Capitalized interest costs | $ $ 533 $ 152 $ 0
Customer Relationships      
Finite-lived intangible assets      
Net intangible asset | $ $ 6,200 $ 7,400