Accounts Payable and Other Accrued Liabilities (Tables)
 9 Months Ended
Sep. 30, 2016
Payables and Accruals [Abstract]  
Components of Accounts Payable and Other Accrued Liabilities
The following table presents the components of accounts payable and other accrued liabilities (in thousands):
 
September 30, 2016
 
December 31,
2015
Accounts payable
$
1,848

 
$
625

Other accrued liabilities
9,420

 
9,583

Operating wind farm upgrade liability
1,012

 
4,909

Turbine operations and maintenance payable
836

 
985

Purchase agreement obligations
—

 
5,749

Land lease rent payable
1,396

 
2,513

Spare-parts inventory payables
550

 
1,181

Payroll liabilities
6,268

 
5,345

Property tax payable
10,391

 
11,145

Sales tax payable
1,147

 
741

Accounts payable and other accrued liabilities
$
32,868

 
$
42,776