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ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2016
Accounting Policies [Abstract]  
Summary of catch-up adjustments
Cumulative catch-up adjustments had the following impact to operating income in the years presented:
 
2016
 
2015
 
2014
 
 
 
 
 
 
Favorable adjustments
$
1,342

 
$
1,308

 
$
5,720

Unfavorable adjustments
(2,483
)
 
(2,954
)
 
(1,719
)
Net operating income adjustments
$
(1,141
)
 
$
(1,646
)
 
$
4,001