Other Financial Information (Narrative) (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) item	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Other Financial Information [Line Items]
Deepwater rig contract exit costs	$ 282,001,000
Day rate commitments payable	271,000,000
Net gains (losses) from foreign currency transactions	$ 87,961,000	$ 40,596,000	$ 73,732,000
United States [Member]
Other Financial Information [Line Items]
Number of deepwater drilling rigs | item	2
Deepwater rig contract exit costs	$ 282,000,000