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Fair Value of Financial Assets and Liabilities, Derivative Assets and Liabilities at Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Derivative Asset, Collateral, Obligation to Return Cash, Offset $ 0 $ 0
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 500 0
Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 3,681 10,934
Other Noncurrent Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 861 3,398
Other Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 6,049 6,788
Other Noncurrent Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 4,255 7,828
Fair Value Measured on a Recurring Basis | Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 1,966 9,218
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset (2,787) [1] (5,137) [2]
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Commodity Trading    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 707 1,440
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset (2,652) [1] (5,137) [2]
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 1,259 7,778
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset (135) [1] 0 [2]
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 402 1,652
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset (109) [1] 0 [2]
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Commodity Trading    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 402  
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset [1] (109)  
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Natural Gas Commodity    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset   1,652
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset [2]   0
Fair Value Measured on a Recurring Basis | Other Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 890 1,628
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset (3,323) [1] (5,137) [2]
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Commodity Trading    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 63 1,628
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset (3,188) [1] (5,137) [2]
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Natural Gas Commodity    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 827  
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset [1] (135)  
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 297  
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset [1] (109)  
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Trading    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 297  
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset [1] (109)  
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 116 1,124
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Assets | Other Derivative Instruments | Commodity Trading    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 116 1,124
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 0
Fair Value Measured on a Recurring Basis | Level 1 | Other Noncurrent Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 0
Fair Value Measured on a Recurring Basis | Level 1 | Other Noncurrent Assets | Other Derivative Instruments | Commodity Trading    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0  
Fair Value Measured on a Recurring Basis | Level 1 | Other Noncurrent Assets | Other Derivative Instruments | Natural Gas Commodity    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset   0
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 144 1,386
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Liabilities | Other Derivative Instruments | Commodity Trading    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 144 1,386
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Liabilities | Other Derivative Instruments | Natural Gas Commodity    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 0  
Fair Value Measured on a Recurring Basis | Level 1 | Other Noncurrent Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 0  
Fair Value Measured on a Recurring Basis | Level 1 | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Trading    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 0  
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 4,632 13,231
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Assets | Other Derivative Instruments | Commodity Trading    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 3,238 5,453
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 1,394 7,778
Fair Value Measured on a Recurring Basis | Level 2 | Other Noncurrent Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 511 1,652
Fair Value Measured on a Recurring Basis | Level 2 | Other Noncurrent Assets | Other Derivative Instruments | Commodity Trading    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 511  
Fair Value Measured on a Recurring Basis | Level 2 | Other Noncurrent Assets | Other Derivative Instruments | Natural Gas Commodity    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset   1,652
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 4,066 5,357
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Liabilities | Other Derivative Instruments | Commodity Trading    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 3,104 5,357
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Liabilities | Other Derivative Instruments | Natural Gas Commodity    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 962  
Fair Value Measured on a Recurring Basis | Level 2 | Other Noncurrent Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 406  
Fair Value Measured on a Recurring Basis | Level 2 | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Trading    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 406  
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 5 0
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Assets | Other Derivative Instruments | Commodity Trading    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 5 0
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 0
Fair Value Measured on a Recurring Basis | Level 3 | Other Noncurrent Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 0
Fair Value Measured on a Recurring Basis | Level 3 | Other Noncurrent Assets | Other Derivative Instruments | Commodity Trading    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0  
Fair Value Measured on a Recurring Basis | Level 3 | Other Noncurrent Assets | Other Derivative Instruments | Natural Gas Commodity    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset   0
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 3 22
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Liabilities | Other Derivative Instruments | Commodity Trading    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 3 22
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Liabilities | Other Derivative Instruments | Natural Gas Commodity    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 0  
Fair Value Measured on a Recurring Basis | Level 3 | Other Noncurrent Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 0  
Fair Value Measured on a Recurring Basis | Level 3 | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Trading    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 0  
Fair Value, Measurements, Nonrecurring | Other Current Assets | Purchased Power Agreements    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 1,715 [3] 1,716 [4]
Fair Value, Measurements, Nonrecurring | Other Noncurrent Assets | Purchased Power Agreements    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 459 [3] 1,746 [4]
Fair Value, Measurements, Nonrecurring | Other Current Liabilities | Purchased Power Agreements    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 5,159 [3] 5,160 [4]
Fair Value, Measurements, Nonrecurring | Other Noncurrent Liabilities | Purchased Power Agreements    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 3,958 [3] 7,828 [4]
Estimate of Fair Value Measurement [Member] | Fair Value Measured on a Recurring Basis | Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 4,753 14,355
Estimate of Fair Value Measurement [Member] | Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Commodity Trading    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 3,359 6,577
Estimate of Fair Value Measurement [Member] | Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 1,394 7,778
Estimate of Fair Value Measurement [Member] | Fair Value Measured on a Recurring Basis | Other Noncurrent Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 511 1,652
Estimate of Fair Value Measurement [Member] | Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Commodity Trading    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 511  
Estimate of Fair Value Measurement [Member] | Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Natural Gas Commodity    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset   1,652
Estimate of Fair Value Measurement [Member] | Fair Value Measured on a Recurring Basis | Other Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 4,213 6,765
Estimate of Fair Value Measurement [Member] | Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Commodity Trading    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 3,251 $ 6,765
Estimate of Fair Value Measurement [Member] | Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Natural Gas Commodity    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 962  
Estimate of Fair Value Measurement [Member] | Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 406  
Estimate of Fair Value Measurement [Member] | Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Trading    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability $ 406  
[1] PSCo nets derivative instruments and related collateral in its consolidated balance sheet when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements at Sept. 30, 2017. At Sept. 30, 2017, derivative assets and liabilities include no obligations to return cash collateral and rights to reclaim cash collateral of $0.5 million. The counterparty netting amounts presented exclude settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.
[2] PSCo nets derivative instruments and related collateral in its consolidated balance sheet when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements at Dec. 31, 2016. At Dec. 31, 2016, derivative assets and liabilities include no obligations to return cash collateral or rights to reclaim cash collateral. The counterparty netting amounts presented exclude settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.
[3] During 2006, PSCo qualified these contracts under the normal purchase exception. Based on this qualification, the contracts are no longer adjusted to fair value and the previous carrying value of these contracts will be amortized over the remaining contract lives along with the offsetting regulatory assets and liabilities.
[4] During 2006, PSCo qualified these contracts under the normal purchase exception. Based on this qualification, the contracts are no longer adjusted to fair value and the previous carrying value of these contracts will be amortized over the remaining contract lives along with the offsetting regulatory assets and liabilities.