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Accounts Receivable (Tables)
 6 Months Ended
Jun. 30, 2017
Receivables [Abstract]  
Summary of Accounts Receivable

 

(Table only in thousands)

 

June 30,

2017

 

 

December 31,

2016

 

Trade receivables

 

$

13,204

 

 

$

11,976

 

Contract receivables

 

 

55,108

 

 

 

72,835

 

Allowance for doubtful accounts

 

 

(2,181

)

 

 

(1,749

)

 

 

$

66,131

 

 

$

83,062