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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Net Income $ 12,725 $ 30,435 $ 24,985 $ 39,996
Other comprehensive income, net of tax:        
Amortization of actuarial losses, net of taxes of ($64) and ($82) for the three months ended June 30, 2017 and 2016, respectively and of ($128) and ($165) for the six months ended June 30, 2017 and 2016, respectively. 87 110 174 219
Amortization of prior service credits, net of taxes of $5 for each of the three months ended June 30, 2017 and 2016, respectively and $9 and $10 for the six months ended June 30, 2017 and 2016, respectively. (6) (7) (13) (13)
Reclassification adjustment for net gains included in income, net of taxes of $1,013 for the three and six months ended June 30, 2016. (1,350) (1,350)
Net unrealized gains on securities, net of taxes of ($436) and $2,252 for the three months ended June 30, 2017 and 2016, respectively and of ($1,247) and ($7,280) for the six months ended June 30, 2017 and 2016, respectively. 601 3,024 1,749 9,794
Net unrealized loss on cash flow hedge, net of taxes of $90 for the three and six months ended June 30, 2017. (124) (124)
Total other comprehensive income, net of tax 558 1,777 1,786 8,650
Comprehensive income $ 13,283 $ 32,212 $ 26,771 $ 48,646