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Basis Of Presentation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Foreign currency translation income (loss) due to re-measurement of assets and liabilities $ 9,407 $ (140) $ (28,389) $ (490)  
Assets 1,154,529   1,154,529   $ 1,096,898
Liabilities $ 826,411   $ 826,411   $ 760,882
Venezuela [Member]          
Equity method investment, ownership percentage 51.00%   51.00%    
Foreign currency translation income (loss) due to re-measurement of assets and liabilities       $ (1,600)  
Assets $ 1,200   $ 1,200    
Liabilities $ 1,100   1,100    
Ministry Of Economy, Finance, And Public Banking, And The Central Bank Of Venezuela [Member] | Venezuela [Member]          
Foreign currency translation income (loss) due to re-measurement of assets and liabilities     (1,900)    
Loss on lower of cost or market charges     $ (2,600)