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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]  
Future Minimum Rental Payments for Operating Leases
Future minimum payments under noncancelable operating leases (with initial lease terms exceeding one year) as of December 31, 2012 were as follows (in thousands):
Years ending December 31
 
2013
$
2,694

2014
2,511

2015
2,251

2016
2,018

2017
1,339

 
$
10,813
Firm Transportation Contracts and Throughput Agreements
The amounts of the required payments related to the transportation and throughput agreements as of December 31, 2012 were as follows (in thousands):
Years ending December 31
 
2013
$
26,653

2014
19,671

2015
12,977

2016
11,346

2017
11,315

Thereafter
14,105

 
$
96,067
Natural Gas Gathering Agreements
The table below presents the base fee contractual obligations under this agreement as of December 31, 2012 (in thousands).
Years ending December 31
 
2013
$
42,634

2014
42,360

2015
42,153

2016
42,091

2017
41,812

Thereafter
141,775

 
$
352,825