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Income Taxes (Schedule Of Components Of Income Tax Expense By Applying Weighted-Average Statutory Income Tax Rate) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Pre-tax (loss) income $ (28,553) $ (76,549) $ 96,594
Weighted-average statutory income tax rate (as a percent) 64.60% 40.90% 31.90%
Income tax (benefit) expense at weighted-average statutory tax rate on pre-tax (loss) income $ (18,445) $ (31,346) $ 30,833
Change in valuation allowance 49,478 71,695 39,621
Non-deductible expenses 6,368 15,641 13,500
Tax benefits, including Brazil and other (24,398) (39,389) (26,948)
Differences including exchange rate and inflation adjustment 5,170 12,980 (14,938)
Others 4,643 2,897 654
Income tax expense $ 22,816 $ 32,479 $ 42,722