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Supplemental Equity Information - Reclassifications out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total reclassifications, before tax | $ 12,070 | $ 2,422 | $ 14,145 | $ 4,322
Income tax effect | (896) | (942) | (1,693) | (1,680)
Total reclassifications, net of tax | 11,174 | 1,480 | 12,452 | 2,642
Amortization of prior service cost |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total reclassifications, before tax | 32 | 80 | 32 | 130
Amortization of actuarial loss |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total reclassifications, before tax | 2,295 | 2,342 | 4,370 | 4,192
Reclassification of available for sale investment |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total reclassifications, before tax | $ 9,743 | $ 0 | $ 9,743 | $ 0

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