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Revenue Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax $ 88,520   $ 473,228  
Revenues 91,239 $ 86,213 479,441 $ 516,413
Local Gas Distribution [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 82,358   455,312  
Natural Gas Storage [Domain] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 2,415   7,189  
Asset management revenue, net | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 2,714   6,974  
Appliance Center [Member] | Transferred at Point in Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 1,033   3,753  
Alternative Revenue [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 1,994   5,285  
Leasing Revenue [Member]        
Disaggregation of Revenue [Line Items]        
Leasing revenue 725   928  
Utility Segment [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 82,358   455,312  
Revenues 85,077   461,525  
Utility Segment [Member] | Local Gas Distribution [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 82,358   455,312  
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 1,994   5,285  
Utility Segment [Member] | Leasing Revenue [Member]        
Disaggregation of Revenue [Line Items]        
Leasing revenue 725   928  
Other Segments [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 6,162   17,916  
Revenues 6,162   17,916  
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 2,415   7,189  
Other Segments [Member] | Asset management revenue, net | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 2,714   6,974  
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 1,033   3,753  
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