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Claims revenue
 12 Months Ended
Dec. 31, 2015
Contractors [Abstract]  
Claims revenue
Claims revenue
Year ended December 31,
 
2015

 
2014

 
2013

Claims revenue recognized
 
$
7,635

 
$
8,230

 
$
17,053

Claims revenue uncollected (classified as unbilled revenue)
 
7,088

 
4,622

 
8,074