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Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | $ (66,382) | $ (74,902) | $ (68,141) | $ (78,053)
OCI (loss) before reclassifications | (944) | (2,032) | (1,744) | (2,453)
Amounts reclassified from accumulated other comprehensive loss | 1,726 | 2,717 | 4,285 | 6,289
Total other comprehensive income | 782 | 685 | 2,541 | 3,836
Ending balance | (65,600) | (74,217) | (65,600) | (74,217)
Derivative Instruments |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (9,209) | (20,364) | (10,385) | (23,058)
OCI (loss) before reclassifications | 25 | 40 | (775) | (381)
Amounts reclassified from accumulated other comprehensive loss | 874 | 1,955 | 2,850 | 5,070
Total other comprehensive income | 899 | 1,995 | 2,075 | 4,689
Ending balance | (8,310) | (18,369) | (8,310) | (18,369)
Pension and other postretirement benefits |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (57,173) | (54,538) | (57,756) | (54,995)
OCI (loss) before reclassifications | (969) | (2,072) | (969) | (2,072)
Amounts reclassified from accumulated other comprehensive loss | 852 | 762 | 1,435 | 1,219
Total other comprehensive income | (117) | (1,310) | 466 | (853)
Ending balance | (57,290) | (55,848) | (57,290) | (55,848)
Arizona Public Service Company |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (46,476) | (50,111) | (48,333) | (53,372)
OCI (loss) before reclassifications | (902) | (2,001) | (1,702) | (2,422)
Amounts reclassified from accumulated other comprehensive loss | 1,727 | 2,712 | 4,384 | 6,394
Total other comprehensive income | 825 | 711 | 2,682 | 3,972
Ending balance | (45,651) | (49,400) | (45,651) | (49,400)
Arizona Public Service Company | Derivative Instruments |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (9,209) | (20,364) | (10,385) | (23,059)
OCI (loss) before reclassifications | 25 | 40 | (775) | (381)
Amounts reclassified from accumulated other comprehensive loss | 874 | 1,954 | 2,850 | 5,070
Total other comprehensive income | 899 | 1,994 | 2,075 | 4,689
Ending balance | (8,310) | (18,370) | (8,310) | (18,370)
Arizona Public Service Company | Pension and other postretirement benefits |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (37,267) | (29,747) | (37,948) | (30,313)
OCI (loss) before reclassifications | (927) | (2,041) | (927) | (2,041)
Amounts reclassified from accumulated other comprehensive loss | 853 | 758 | 1,534 | 1,324
Total other comprehensive income | (74) | (1,283) | 607 | (717)
Ending balance | $ (37,341) | $ (31,030) | $ (37,341) | $ (31,030)

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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