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Income Taxes (Narrative) (Details) $ in Thousands |  | 12 Months Ended | 15 Months Ended | 60 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2018 USD ($) | Dec. 31, 2019 USD ($) generator | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) fund
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Income tax expense related to impact of the Tax Act |  |  |  | $ 985 | $ 41,700 | $ 42,700 |
Remeasurements of certain deferred tax assets and liabilities, net |  |  |  |  | 33,100 |  |
Remeasurements of tax credits and other tax benefits related to qualified affordable housing partnerships |  |  |  |  | $ 7,900 |  |
Decrease in tax credits recognized from investments |  |  | $ 14,700 |  |  |  |
Increase in effective tax rate (as a percent) |  |  | 6.10% |  |  |  |
Effective tax rate (as a percent) |  |  | 20.10% | 14.00% | 31.20% |  |
Valuation allowance |  |  | $ 21 | $ 128 |  | 128 | $ 128
Deferred tax assets, net |  |  | $ 106,487 | $ 117,640 |  | $ 117,640 | $ 117,640
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate | [1] | $ 0 |  |  |  |  |
DC Solar Tax Credit Investments |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Number of tax credit funds | fund |  |  |  |  |  |  | 4
Claimed investment tax credits |  |  |  |  |  |  | $ 53,900
Deferred tax liability reduction |  |  |  |  |  |  | 5,700
Net impact to Consolidated Financial Statements |  |  |  |  |  |  | $ 48,200
Mobile service generator | generator |  |  | 0 |  |  |  |
Amount reversed from previously claimed tax credits |  |  | $ 33,600 |  |  |  |
Amount reversed from deferred tax liability |  |  | 3,500 |  |  |  |
Additional income tax expense |  |  | $ 30,100 |  |  |  |
Accounting Standards Update 2018-02 |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate |  | 6,656 |  |  |  |  |
Retained Earnings |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate | [1] | 6,656 |  |  |  |  |
Retained Earnings | Accounting Standards Update 2018-02 |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate |  | 6,656 |  |  |  |  |
AOCI, net of Tax |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate | [1] | (6,656) |  |  |  |  |
AOCI, net of Tax | Accounting Standards Update 2018-02 |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate |  | $ (6,656) |  |  |  |  |
[1] | Represents amounts reclassified from AOCI to retained earnings due to the early adoption of ASU 2018-02, Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income in the first quarter of 2018. Refer to Note 1 — Summary of Significant Accounting Policies to the Consolidated Financial Statements for additional information.

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