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Income Taxes, Deferred Tax Asset Valuation Adjustments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Valuation Allowance [Roll Forward] |  |  |  |  |  |  |  |
Recognition of valuation allowance on foreign tax credit carryforwards |  | $ 52,000 |  |  |  |  |  |
Deferred Tax Asset Valuation Allowance [Member] |  |  |  |  |  |  |  |
Valuation Allowance [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  | $ 9,137 |  | $ 49,271 | [1] | $ 35,999 |
Additions charged to cost and expenses |  |  | 53,983 | [2] | 692 |  | 12,948 |
Decreases |  |  | (6,400) | [3] | (40,442) | [4] | (2,943) | [5]
Adjustments | [6] |  | 186 |  | (384) |  | 3,267 |
Ending balance |  | $ 56,906 | $ 56,906 |  | $ 9,137 |  | $ 49,271 | [1]
[1] | The increase was due primarily to the deferred tax assets created by the unrealized loss in Venezuela for which the Company set up a full valuation allowance.
[2] | Increase in valuation is due primarily to the $52.0 million that was recorded on the foreign tax credit carryforward. The additional amount is due to net operating losses in foreign markets.
[3] | Decrease is due primarily to the write-off of Brazil deferred tax assets, which had no impact to the income statement, as a valuation allowance had been previously recorded against the asset.
[4] | Decrease in valuation allowance due to lapse in statute of limitation of the net operating losses carryforward and due to the write off of Venezuelan deferred tax assets, which had no impact to the income statement.
[5] | Decreases in valuation allowance due to lapse in statute of limitation of the net operating losses carryforward which had no impact to the income statement.
[6] | Represents the net currency effects of translating valuation allowances at current rates of exchange.

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- Definition Amount charged to expense to increase valuation allowance for foreign tax credit carryforwards pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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