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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 30, 2014
Commitments and Contingencies Disclosure [Abstract]  
Environmental Liabilities
Changes in our environmental liabilities during the period were as follows (in thousands):
 
 
Tioga Crude Oil Pipeline Release
 
Chevron Corrective Action Order
 
Other Liabilities
 
Total
Balance at December 31, 2013
 
$
11,568

 
$
8,016

 
$
4,856

 
$
24,440

Additions
 
5,636

 
—

 
571

 
6,207

Expenditures
 
(2,122
)
 
(5,159
)
 
(325
)
 
(7,606
)
Balance at June 30, 2014
 
$
15,082

 
$
2,857

 
$
5,102

 
$
23,041