Annual report pursuant to Section 13 and 15(d)

Other (Narrative) (Details)

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Other (Narrative) (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Jan. 31, 2016
$ / d
Dec. 31, 2015
USD ($)
contract
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Operating Leases And Other Property Plant And Equipment [Line Items]          
Rig termination fee   $ 3,075      
Proceeds from sale of equipment       $ 114 $ 527
Impairment of other property and equipment held for sale       $ 1,707 $ 1,177
Gain on sale of equipment     $ 1,080    
Subsequent Event [Member]          
Operating Leases And Other Property Plant And Equipment [Line Items]          
Operating lease payable amount per day for placing rig on standby | $ / d 15,000        
Horizontal Drilling [Member]          
Operating Leases And Other Property Plant And Equipment [Line Items]          
Number of contracts | contract   2      
Extended contract expiration terms   The Cactus 2 Rig was initially contracted for a term of two years in April 2014. The Cactus 2 Rig replaced a previously contracted horizontal drilling rig, which was cancelled in March 2014. In March 2015, the Company extended the terms of its Cactus 1 Rig and Cactus 2 Rig to end in July 2018 and August 2018, respectively.      
Operating leases, term of contract   2 years