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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 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


—


195


5,831

Expenditures

(851
)

(1,515
)

(111
)

(2,477
)
Balance at March 31, 2014

$
16,353


$
6,501


$
4,940


$
27,794