Summary Of Major Accounting Policies Business Combination Disclosure (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 0	$ 229,979	$ 224,000
Subsea BOP control systems inventory write-down	$ 0	$ 9,025