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Condended Financial Information of Registrant Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | $ 13,886 | $ (5,822) | $ 16,178 | $ 15,185 | $ 19,005 | $ 18,824 | $ 7,006 | $ 27,786 | $ 39,427 | $ 72,621 | $ (45,835)
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |
Other post-retirement benefits income (loss), net of tax |  |  |  |  |  |  |  |  |  | 529 | (52) | 2,196
Total other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  | 529 | (52) | 2,196
Comprehensive income (loss) |  |  |  |  |  |  |  |  |  | 39,956 | 72,569 | (43,639)
Parent Company |  |  |  |  |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | 39,427 | 72,621 | (45,835)
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |
Other post-retirement benefits income (loss), net of tax | [1] |  |  |  |  |  |  |  |  | 529 | (52) | 2,196
Total other comprehensive income (loss), net of tax | [1] |  |  |  |  |  |  |  |  | 529 | (52) | 2,196
Comprehensive income (loss) | [1] |  |  |  |  |  |  |  |  | $ 39,956 | $ 72,569 | $ (43,639)
[1] | Other comprehensive income (loss) relates to benefit plans at our subsidiaries.

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e557-108580 + Details
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