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Revenue and Contract Costs (Tables)
 3 Months Ended
Mar. 31, 2017
Contractors [Abstract]  
Pass-through Costs as a Percentage of Revenue Our pass-through costs as a percentage of revenue for each period presented were as follows:
 
Three Months Ended March 31,
 
 
2017
 
2016
 
Pass-through costs as a percentage of revenues
29.4%
 
40.0%