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Discontinued Operations Discontinued Operations Summary of Income Statement Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Disposal Group, Including Discontinued Operation, Revenue                     $ 0
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax                 $ 0 $ 0 777
Discontinued Operation Gain Loss From Disposal Of Discontinued Operation Before Income Taxes Net of Transaction Costs                     706
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax                     706
Discontinued Operation, Tax Effect of Discontinued Operation                     (4,441)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest                 0 0 5,147
Comprehensive income attributable to noncontrolling interests $ (37) $ (7) $ 49 $ (21) $ (12) $ (27) $ (33) $ (16) (16) (88) (90)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent                 $ 0 $ 0 5,147
Ecova [Member]                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Discontinued Operation Transaction Expenses                     71
Comprehensive income attributable to noncontrolling interests                     $ 0