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Stockholders' Equity (Reclassifications in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Provision for income taxes, investments | $ (55,883) | $ (69,300)
Benefits Liability, Net of Tax [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax | (463) | (334)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax | 163 | 128
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax | (300) | (206)
Total reclassifications for the period | (300) | (206)
Net Unrealized Holdings Gains on Available-for-sale Securities [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total reclassifications for the period | 0 | 33
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total reclassifications for the period | (300) | (173)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net Unrealized Holdings Gains on Available-for-sale Securities [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other income, net | 0 | 52
Provision for income taxes, investments | 0 | (19)
Income (loss), including portion attributable to noncontrolling interest | $ 0 | $ 33

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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (b)(7) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20187-122688 + Details
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