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Summary of Significant Accounting Policies (Utility Plant Intangible Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Property, Plant and Equipment, Gross | $ 1,666,381 | $ 1,524,422
Finite-Lived Intangible Assets, Gross | 23,989 | 22,675
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | 436
Infrastructure [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Finite-Lived Intangible Assets, Gross | $ 2,524 |
Infrastructure [Member] | Adjustments for New Accounting Pronouncement [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Property, Plant and Equipment, Gross |  | (1,859)
Finite-Lived Intangible Assets, Gross |  | 1,859
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment |  | (377)
Finite-Lived Intangible Assets, Accumulated Amortization |  | $ 377
Minimum [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Useful life of intangible assets | 5 years |
Maximum [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Useful life of intangible assets | 70 years |

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