|**Taxes Other Than Income Taxes**            | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|-------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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|**Taxes Other Than Income Taxes [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Taxes Other Than Income Taxes                | Note 12 –Taxes Other than Income Taxes
		
		The following table provides the components of taxes other than income taxes:
		﻿﻿﻿
				
				Three Months Ended
				
				Six Months Ended﻿
				
				June 30,
				
				June 30,﻿
				
				2018
				
				2017
				
				2018
				
				2017﻿Property
				
				$
				6,775
				
				$
				6,867
				
				$
				13,524
				
				$
				13,652﻿Gross receipts, excise and franchise
				
				
				3,789
				
				
				3,363
				
				
				7,053
				
				
				6,538﻿Payroll
				
				
				2,180
				
				
				2,132
				
				
				5,455
				
				
				5,256﻿Regulatory assessments
				
				
				627
				
				
				630
				
				
				1,254
				
				
				1,259﻿Pumping fees
				
				
				1,424
				
				
				1,350
				
				
				2,415
				
				
				2,294﻿Other
				
				
				34
				
				
				77
				
				
				95
				
				
				157﻿Total taxes other than income
				
				$
				14,829
				
				$
				14,419
				
				$
				29,796
				
				$
				29,156﻿
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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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