Assets Held for Sale, Divestitures and Acquisitions Acquisitions (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions			1 Months Ended	9 Months Ended
	Oct. 04, 2016	Aug. 12, 2016	Oct. 26, 2016	Sep. 30, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Restricted Cash and Cash Equivalents, Noncurrent				$ 49,000	$ 0
Stock Issued During Period, Shares, New Issues		18.4
Common Stock, Par or Stated Value Per Share				$ 0.01	$ 0.01
Rock Oil Acquisition 2016 [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross				$ 980,000
Restricted Cash and Cash Equivalents, Noncurrent				$ 49,000
Subsequent Event [Member] | Rock Oil Acquisition 2016 [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	$ 991,000
Scenario, Forecast [Member] | Subsequent Event [Member] | QStar Acquisition 2016 [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross			$ 1,100,000
Stock Issued During Period, Shares, New Issues			13.4
Common Stock, Par or Stated Value Per Share			$ 0.01