Accounts Payable
12 Months Ended
Dec. 31, 2015
Payables and Accruals [Abstract]  
Accounts Payable
Accounts payable and accrued liabilities as of December 31, 2015 and 2014 were as follows (in thousands):
 
 
 
December 31,
 
 
2015
 
2014
Trade accounts payable
 
$
48,501

 
$
71,282

Payroll liabilities
 
14,914

 
28,802

Accrued contract costs
 
17,571

 
30,007

Self-insurance accrual
 
12,128

 
15,915

Other accrued liabilities
 
14,595

 
23,189

Total accounts payable and accrued liabilities
 
$
107,709

 
$
169,195