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Revenue Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax $ 120,777   $ 384,708  
Revenues 124,567 $ 134,476 388,202 $ 430,200
Local Gas Distribution [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 114,725   372,954  
Natural Gas Storage [Domain] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 2,736   5,314  
Asset management revenue, net | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 2,140   3,719  
Appliance Center [Member] | Transferred at Point in Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 1,176   2,721  
Alternative Revenue [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 3,663   3,291  
Leasing Revenue [Member]        
Disaggregation of Revenue [Line Items]        
Leasing revenue 127   203  
Utility Segment [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 114,725   372,954  
Revenues 118,515   376,448  
Utility Segment [Member] | Local Gas Distribution [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 114,725   372,954  
Utility Segment [Member] | Natural Gas Storage [Domain] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 0   0  
Utility Segment [Member] | Asset management revenue, net | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 0   0  
Utility Segment [Member] | Appliance Center [Member] | Transferred at Point in Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 0   0  
Utility Segment [Member] | Alternative Revenue [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 3,663   3,291  
Utility Segment [Member] | Leasing Revenue [Member]        
Disaggregation of Revenue [Line Items]        
Leasing revenue 127   203  
Other Segments [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 6,052   11,754  
Revenues 6,052   11,754  
Other Segments [Member] | Local Gas Distribution [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0   0  
Other Segments [Member] | Natural Gas Storage [Domain] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 2,736   5,314  
Other Segments [Member] | Asset management revenue, net | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 2,140   3,719  
Other Segments [Member] | Appliance Center [Member] | Transferred at Point in Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 1,176   2,721  
Other Segments [Member] | Alternative Revenue [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 0   0  
Other Segments [Member] | Leasing Revenue [Member]        
Disaggregation of Revenue [Line Items]        
Leasing revenue $ 0   $ 0