|**Taxes Other Than Income Taxes (Tables)**   | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|-------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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|**Taxes Other Than Income Taxes [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Components Of Taxes Other Than Income Taxes  | ﻿﻿﻿
				
				Three Months Ended﻿
				
				March 31,﻿
				
				2019
				
				2018﻿Property
				
				$
				6,466
				
				$
				6,749﻿Gross receipts, excise and franchise
				
				
				3,220
				
				
				3,265﻿Payroll
				
				
				3,481
				
				
				3,275﻿Regulatory assessments
				
				
				747
				
				
				627﻿Pumping fees
				
				
				969
				
				
				991﻿Other
				
				
				86
				
				
				60﻿Total taxes other than income
				
				$
				14,969
				
				$
				14,967﻿
		﻿
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|﻿Property                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|﻿Gross receipts, excise and franchise        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|﻿Payroll                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|﻿Regulatory assessments                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|﻿Pumping fees                                |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|﻿Other                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|﻿Total taxes other than income               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|﻿                                            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    

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