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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]  
Schedule of future minimum rental payments for operating leases
The following table presents the Company’s future minimum payments under noncancelable operating leases and other commitments as of December 31, 2015:
 
Total
 
2016
 
2017
 
2018
 
2019
 
2020
 
Thereafter
(in thousands)
 
 
 
 
 
 
 
 
 
 
 
 
 
Operating leases (1)
$
9,377

 
$
3,710

 
$
2,234

 
$
1,279

 
$
1,175

 
$
979

 
$
—

Firm natural gas transportation contracts (2)
146,981

 
33,446

 
33,417

 
23,972

 
22,528

 
19,123

 
14,495

Other commitments (3)
2,442

 
2,442

 
—

 
—

 
—

 
—

 
—

Total
$
158,800

 
$
39,598

 
$
35,651

 
$
25,251

 
$
23,703

 
$
20,102

 
$
14,495


(1) 
Operating leases relate primarily to obligations associated with the Company’s office facilities, rail cars and vehicles.
(2) 
The Company enters into certain firm commitments to transport natural gas production to market and to transport natural gas for use in the Company’s cogeneration and conventional steam generation facilities. The remaining terms of these contracts range from approximately two to eight years and require a minimum monthly charge regardless of whether the contracted capacity is used or not
(3) 
Other commitments relate primarily to cogeneration facility management services and equipment rental obligations.