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Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Tabular reconciliation of the total amounts of unrecognized tax benefits, excluding interest and penalties, at the beginning and end of the year |  |  |
Total unrecognized tax benefits, beginning of the year | $ 41,966 | $ 36,075 | $ 34,447
Additions for tax positions of the current year | 3,436 | 2,937 | 2,695
Additions for tax positions of prior years | 2,696 | 4,783 | 886
Reductions for tax positions of prior years for: |  |  |
Changes in judgment | (1,764) | (1,829) | (1,953)
Settlements with taxing authorities | 0 | 0 | 0
Lapses of applicable statute of limitations | (5,603) | 0 | 0
Total unrecognized tax benefits, end of the year | 40,731 | 41,966 | 36,075
ARIZONA PUBLIC SERVICE COMPANY |  |  |
Tabular reconciliation of the total amounts of unrecognized tax benefits, excluding interest and penalties, at the beginning and end of the year |  |  |
Total unrecognized tax benefits, beginning of the year | 41,966 | 36,075 | 34,447
Additions for tax positions of the current year | 3,436 | 2,937 | 2,695
Additions for tax positions of prior years | 2,696 | 4,783 | 886
Reductions for tax positions of prior years for: |  |  |
Changes in judgment | (1,764) | (1,829) | (1,953)
Settlements with taxing authorities | 0 | 0 | 0
Lapses of applicable statute of limitations | (5,603) | 0 | 0
Total unrecognized tax benefits, end of the year | $ 40,731 | $ 41,966 | $ 36,075

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=84176650&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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