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Segment Information (Schedule of Revenues from External Customers and Long-Lived Assets) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
drilling_rigs
Sep. 30, 2016
USD ($)
drilling_rigs
Sep. 30, 2017
USD ($)
drilling_rigs
Sep. 30, 2016
USD ($)
drilling_rigs
Dec. 31, 2016
USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues $ 117,281 $ 68,353 $ 320,168 $ 205,595  
Identifiable assets 707,442 722,797 707,442 722,797 $ 700,102
Drilling Services Segment [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Identifiable assets $ 440,392 463,621 $ 440,392 463,621  
Drilling Rigs | drilling_rigs 24   24    
Colombia [Member] | Drilling Services Segment [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues $ 7,403 622 $ 26,379 1,979  
Identifiable assets $ 32,340 $ 37,444 $ 32,340 $ 37,444  
Drilling Rigs | drilling_rigs 8   8    
Colombia [Member] | Drilling Services Segment [Member] | Drilling Rigs [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Drilling Rigs | drilling_rigs 5 5 5 5  
Colombia [Member] | Drilling Services Segment [Member] | Assets Leased From Others [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Drilling Rigs | drilling_rigs 3 3 3 3