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Earnings per share and shareholders' equity (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Reclassifications out of accumulated other comprehensive income/(loss) |  |  |  |
Interest expense | $ 19,613 | $ 20,199 | $ 39,401 | $ 38,738
Amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost | (5,680) | (3,768) | (11,701) | (7,641)
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets | 4,999 | 3,289 | 10,312 | 6,684
Amount reclassified from AOCI |  |  |  |
Reclassifications out of accumulated other comprehensive income/(loss) |  |  |  |
Total reclassifications | 2 | 457 | 769 | 994
Derivatives qualified as cash flow hedges Interest rate contracts (settled in 2011) | Amount reclassified from AOCI |  |  |  |
Reclassifications out of accumulated other comprehensive income/(loss) |  |  |  |
Revenues-bank (net gains on sales of securities) | (738) | (81) | (738) | (81)
Interest expense | 59 | 59 | 118 | 118
Retirement benefit plan items | Amount reclassified from AOCI |  |  |  |
Reclassifications out of accumulated other comprehensive income/(loss) |  |  |  |
Amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost | 5,680 | 3,768 | 11,701 | 7,641
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets | $ (4,999) | $ (3,289) | $ (10,312) | $ (6,684)

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- Definition The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Subparagraph h -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 3 -Article 7 + Details
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