Quarterly report pursuant to Section 13 or 15(d)

Other (Narrative) (Details)

v3.7.0.1
Other (Narrative) (Details) - Horizontal Drilling Rig [Member]
 1 Months Ended 3 Months Ended
Apr. 30, 2017
$ / d
Mar. 31, 2017
contract
Operating Leases And Other Property Plant And Equipment [Line Items]    
Number of contracts | contract   3
Subsequent Event [Member]    
Operating Leases And Other Property Plant And Equipment [Line Items]    
Operating lease rate per day beginning July 2017 through July 2019 | $ / d 18,000