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Assets Held for Sale
 12 Months Ended
Dec. 31, 2013
Assets Held for Sale [Abstract]  
Assets Held for Sale
Assets Held for Sale
Net assets held for sale represent the assets that were or are expected to be sold, net of liabilities, which were or are expected to be assumed by the purchaser. As of December 31, 2013, the assets in the Company’s Sanish project area and other non-operated leases adjacent to its Sanish position in North Dakota were held for sale (see Note 18 — Subsequent Events). The Company did not have assets classified as held for sale as of December 31, 2012. The following table presents balance sheet data related to the assets held for sale:
 
December 31, 2013
 
(In thousands)
Assets
 
Oil and gas properties
$
191,384

Less: accumulated depreciation, depletion, amortization and impairment
(54,318
)
Total assets
$
137,066

 
 
Liabilities
 
Asset retirement obligation
$
1,973

Total liabilities
$
1,973

 
 
Net assets
$
135,093