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Contingencies (Tables)
 12 Months Ended
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]  
Activity related to self-insured property and casualty reserves The following table summarizes the 2016 and 2015 activity related to our net self-insured property and casualty reserves as of December 31, 2016.

 
 
Beginning Balance
 
Expense
 
Payments
 
Ending Balance
2016 Activity
 
$
102

 
42

 
(46
)
 
$
98

2015 Activity
 
$
116

 
39

 
(53
)
 
$
102