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Segment Information (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
segment
Mar. 31, 2015
USD ($)
Segment Reporting [Abstract]    
Number of operating segments | segment 2  
Segment Reporting Information [Line Items]    
Revenues from external customers $ 500,180 $ 547,039
Direct operating costs (excluding items below) 204,832 255,734
Depreciation and amortization 98,852 89,690
Selling, general and administrative 26,930 27,586
Other operating items 2,177 (513)
INCOME FROM OPERATIONS 167,389 174,542
Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Revenues from external customers 500,180 547,039
Direct operating costs (excluding items below) 204,832 255,734
Depreciation and amortization 95,702 86,696
Selling, general and administrative 0 0
Other operating items 2,193 0
INCOME FROM OPERATIONS 197,453 204,609
Operating Segments [Member] | Deepwater [Member]    
Segment Reporting Information [Line Items]    
Revenues from external customers 222,534 146,871
Direct operating costs (excluding items below) 66,982 59,027
Depreciation and amortization 27,348 17,663
Selling, general and administrative 0 0
Other operating items 297 0
INCOME FROM OPERATIONS 127,907 70,181
Operating Segments [Member] | Jack-ups [Member]    
Segment Reporting Information [Line Items]    
Revenues from external customers 277,646 400,168
Direct operating costs (excluding items below) 137,850 196,707
Depreciation and amortization 68,354 69,033
Selling, general and administrative 0 0
Other operating items 1,896 0
INCOME FROM OPERATIONS 69,546 134,428
Unallocated Costs and Other [Member]    
Segment Reporting Information [Line Items]    
Revenues from external customers 0 0
Direct operating costs (excluding items below) 0 0
Depreciation and amortization 3,150 2,994
Selling, general and administrative 26,930 27,586
Other operating items (16) (513)
INCOME FROM OPERATIONS $ (30,064) $ (30,067)