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Long-Term Debt (Narrative) (Details)
BRL in Thousands
 1 Months Ended 12 Months Ended
Dec. 17, 2013
USD ($)
Jul. 18, 2011
USD ($)
Jul. 13, 2011
USD ($)
Nov. 30, 2015
BRL
Dec. 31, 2015
USD ($)
Dec. 31, 2013
USD ($)
Nov. 30, 2015
USD ($)
Oct. 07, 2013
USD ($)
Sep. 30, 2013
USD ($)
Sep. 27, 2013
USD ($)
Oct. 31, 2009
USD ($)
2023 Notes [Member]                      
Debt Instrument [Line Items]                      
Amount partially used to finance the purchase of 2019 Notes                   $ 378,409,000  
Percentage of long term debt purchase price                   100.909%  
Net discount         $ 5,420,000            
Discount related to non-cash issuance         8,829,000            
Premium related to cash issuance         3,409,000            
Financing cost of issuance of debt         $ 3,313,000            
Amount of debt issued as consideration for the partial exchange of 2019 Notes               $ 542,000      
2016 Notes [Member]                      
Debt Instrument [Line Items]                      
Financing cost of issuance of debt     $ 3,699,000                
Redemption price, percentage of principal amount redeemed       6.97%              
Redemption price, principal amount redeemed | BRL       BRL 47,039              
Redemption price, percentage       93.75%              
Redemption price, amount             $ 11,710,000        
2019 Notes [Member]                      
Debt Instrument [Line Items]                      
Percentage of long term debt purchase price                     99.136%
Principal amount of debt $ 99,767,000                   $ 450,000,000
Long-term debt maturity date         Oct. 01, 2019            
Long-term debt, fixed interest rate (as a percent)                     7.50%
Percentage of redeemed long term debt   31.42%                  
Outstanding principal amount of redeemed debt $ 108,875,000 $ 141,400,000                  
Percentage of redemption price over book value 109.129% 107.50%                  
Amount of Notes exchanged               512,000 $ 89,955,000    
Amount of Notes purchased                 118,366,000    
Total aggregate amount of Notes exchanged and purchased                 $ 208,321,000    
Percentage of outstanding principal amount represented by total aggregate amount of Notes exchanged and purchased                 67.50%    
Cash paid as consideration for exchange               $ 2,000 $ 51,000    
Amount paid as tender consideration for purchase                 $ 128,131,000    
Percentage of redemption price equal to amount paid as tender consideration for purchase                 108.25%    
Cash paid for accrued and unpaid interests $ 1,580,000               $ 7,638,000    
One-time loss, debt instrument 23,467,000                    
Loss related consideration in excess of principal amount 18,873,000                    
Loss related to accelerated amortization of deferred financing cost 2,599,000                    
Loss related to accelerated accretion of original discount 1,127,000                    
Loss related to cost incurred in connection with exchange offer $ 868,000                    
Loss incurred from notes redemption           $ 18,873,000          
2023 Senior Notes [Member]                      
Debt Instrument [Line Items]                      
Principal amount of debt                 $ 98,225,000