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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.