Accrued Expenses and Other Current Liabilities (Tables)
 12 Months Ended
Dec. 31, 2014
Payables and Accruals [Abstract]  
Schedule of accrued expenses and other current liabilities
Accrued expenses and other current liabilities were as follows (in thousands):

 
 
December 31,
 
 
2014
 
2013
Accrued capital expenditures
 
$
17,134

 
$
2,562

Accrued expenses
 
7,036

 
5,412

Gas imbalances payable
 
1,069

 
4,305

Other
 
549

 
2,779

 
 
$
25,788

 
$
15,058