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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]  
Schedule of future minimum rental payments for operating leases
The table below presents the Company’s future minimum payments under noncancelable operating leases and other commitments as of December 31, 2014:
 
Total
 
2015
 
2016
 
2017
 
2018
 
2019
 
Thereafter
(in thousands)
 
 
 
 
 
 
 
 
 
 
 
 
 
Operating leases (1)
$
13,865

 
$
4,384

 
$
3,801

 
$
2,258

 
$
1,269

 
$
1,174

 
$
979

Other commitments (2)
5,294

 
2,852

 
2,442

 
—

 
—

 
—

 
—

Firm natural gas transportation contracts (3)
180,399

 
33,418

 
33,446

 
33,417

 
23,972

 
22,527

 
33,619

Total
$
199,558

 
$
40,654

 
$
39,689

 
$
35,675

 
$
25,241

 
$
23,701

 
$
34,598


(1) 
Operating leases relate primarily to obligations associated with the Company’s office facilities, vehicles and rail cars.
(2) 
Other commitments relate primarily to cogeneration facility management services and equipment purchase obligations.
(3) 
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 one to nine years and require a minimum monthly charge regardless of whether the contracted capacity is used or not.