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Discontinued Operations Discontinued Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended 24 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Jun. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Business Disposition Contract Sales Price           $ 335,000
Proceeds from sale of Ecova, net of cash sold $ 0 $ 0 $ 13,856      
Proceeds from Divestiture of Businesses         $ 143,700  
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax       $ 69,700 $ 74,800  
Ecova [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Discontinued Operation Transaction Expenses     $ 71