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Commitments and Contingencies
 12 Months Ended
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]  
Commitments and Contingencies
Commitments and Contingencies
Lease obligations. The Company has operating leases for office space and other property and equipment. The Company incurred rental expense of $1.6 million, $1.5 million and $0.8 million for the years ended December 31, 2013, 2012 and 2011, respectively.
Future minimum annual rental commitments under non-cancelable leases at December 31, 2013 are as follows:
 
 
(In thousands)
2014
$
2,927

2015
2,957

2016
2,992

2017
2,235

2018
—

Thereafter
—

 
$
11,111


Drilling contracts. As of December 31, 2013, the Company had certain drilling rig contracts with initial terms greater than one year. In the event of early contract termination under these contracts, the Company would be obligated to pay approximately $26.2 million as of December 31, 2013 for the days remaining through the end of the primary terms of the contracts.
Volume commitment agreements. As of December 31, 2013, the Company had certain agreements with an aggregate requirement to deliver a minimum quantity of 11.6 MMBbl and 11.8 Bcf from its Williston Basin project areas within specified timeframes, all of which are less than six years. Future obligations under these agreements are $49.3 million as of December 31, 2013.
Purchase agreements. As of December 31, 2013, the Company had certain agreements for the purchase of freshwater with an aggregate future obligation of approximately $5.0 million.
Cost sharing agreements. As of December 31, 2013, the Company had certain agreements to share the cost to construct and install electrical facilities. The Company’s estimated future obligation under these agreements was $12.7 million as of December 31, 2013.
    
Investment commitment. As of December 31, 2013, the Company had a remaining capital commitment to invest, expend and/or incur expenses of $7.0 million in connection with drilling and completion activities for certain wells located in its East Nesson project area, in exchange for the transfer of assets in connection with the East Nesson Acquisitions.
Litigation. The Company is party to various legal and/or regulatory proceedings from time to time arising in the ordinary course of business. The Company believes all such matters are without merit or involve amounts which, if resolved unfavorably, either individually or in the aggregate, will not have a material adverse effect on its financial condition, results of operations or cash flows.