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ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]  
Summary of catch-up adjustments
Cumulative catch-up adjustments had the following impact to operating income in the years presented:
 
 
 
 
 
 
 
2015
 
2014
 
2013
 
 
 
 
 
 
Favorable adjustments
1,308

 
5,720

 
106

Unfavorable adjustments
(2,954
)
 
(1,719
)
 
(1,609
)
Net operating income adjustments
(1,646
)
 
4,001

 
(1,503
)