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Derivative Instruments (Narrative) (Details)
$ / shares in Units, BRL in Millions
 2 Months Ended 12 Months Ended
Nov. 13, 2015
USD ($)
Sep. 23, 2014
USD ($)
Sep. 30, 2015
USD ($)
shares
Dec. 31, 2015
USD ($)
amendment
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
shares
Nov. 13, 2015
BRL
Nov. 13, 2015
USD ($)
Sep. 30, 2014
Nov. 07, 2013
USD ($)
Oct. 04, 2013
USD ($)
Aug. 31, 2013
Dec. 31, 2012
shares
Aug. 20, 2012
$ / shares
shares
Apr. 24, 2012
BRL
Apr. 24, 2012
USD ($)
Derivative [Line Items]                                
Shares of common stock | shares       210,538,896 210,216,043 209,867,426             209,529,412      
Collateral deposits, minimum threshold   $ 3,000,000   $ 0 $ 3,000,000                      
Collateral deposit, incremental payments   $ 500,000   500,000                        
Collateral deposits       $ 0 4,832,000                      
Number of amendments to conditions of collateral deposit | amendment       2                        
Interest       $ 64,229,000 $ 71,369,000 $ 61,771,000                    
Class A Shares Of Common Stock [Member]                                
Derivative [Line Items]                                
Shares of common stock | shares       130,538,896 130,216,043 129,867,426             129,529,412      
Total Equity Return Swap [Member]                                
Derivative [Line Items]                                
Interest paid related to derivative instruments       $ 522,000 $ 593,000 $ 746,000                    
Total Equity Return Swap [Member] | Class A Shares Of Common Stock [Member]                                
Derivative [Line Items]                                
Shares of common stock | shares           1,250,000               2,272,551    
Appreciation (depreciation) receives (pays) plus dividends per share (in dollars per share) | $ / shares                           $ 13.77    
Notional amount of derivative           $ 17,211,000                    
Settlement payment for share reductions     $ 9,681,000     1,731,000                    
Notional amount (in shares) | shares     1,022,551                          
Forward Contracts [Member]                                
Derivative [Line Items]                                
Net collections (payments) to derivative instrument hedges       2,306,000 1,451,000 628,000                    
Bank Of America, N.A. [Member] | Cross-Currency Interest Rate Swaps [Member]                                
Derivative [Line Items]                                
Notional amount of derivative                               $ 37,433,000
Interest rate of derivative instrument (as a percent)                             4.90% 4.90%
Amount of swap agreement settled                     $ 9,975,000          
Loss from early settlement           4,187,000                    
Net interest received from counterparty           1,828,000                    
Bank Of America, N.A. [Member] | 2016 Notes [Member] | Cross-Currency Interest Rate Swaps [Member]                                
Derivative [Line Items]                                
Notional amount of derivative | BRL                             BRL 70  
Interest rate of derivative instrument (as a percent)                             10.25% 10.25%
JP Morgan Chase Bank, N.A. [Member] | Cross-Currency Interest Rate Swaps [Member]                                
Derivative [Line Items]                                
Notional amount of derivative             BRL 108 $ 28,300,000   $ 47,300,000            
Collateral deposits, minimum threshold               $ 5,000,000                
Collateral deposit, incremental payments $ 250,000                              
Interest rate of derivative instrument (as a percent)             4.38% 4.38%                
Percentage of principal and interest collections hedged (as a percent)                   53.08%            
Proceeds from amendment of derivative instrument agreement 19,817,000                              
Loss on amendment to derivative instrument agreement 2,650,000                              
Deferred amount in accumulated other comprehensive income $ 6,666,000                              
Interest       1,933,000 3,512,000                      
Brazil Real [Member] | JP Morgan Chase Bank, N.A. [Member] | Cross-Currency Interest Rate Swaps [Member]                                
Derivative [Line Items]                                
Interest rate of derivative instrument (as a percent)             13.00% 13.00%                
Derivatives Designated As Hedging Instruments [Member] | Forward Contracts [Member]                                
Derivative [Line Items]                                
Notional amount of derivative       12,375,000 $ 30,454,000 $ 17,633,000                    
Notional amount outstanding       $ 10,240,000                        
LIBOR [Member] | Total Equity Return Swap [Member] | Class A Shares Of Common Stock [Member]                                
Derivative [Line Items]                                
Basis point spread on variable rate (as a percent)       4.50%         3.80%     3.30%