Quarterly report pursuant to Section 13 or 15(d)

Other Long-term Debt (Details)

v3.2.0.727
Other Long-term Debt (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]      
Debt Instrument, Carrying Amount $ 317,090 $ 317,090  
Long-term borrowings $ 5,854,584 $ 5,854,584 $ 4,335,962
Debt Instrument, Maturity Date, Description no longer than 90 days    
Debt Instrument, Description of Variable Rate Basis three month LIBOR    
Senior Note Payable Due April 2017 Variable      
Debt Instrument [Line Items]      
Debt Instrument, Description of Variable Rate Basis   0  
Debt Instrument, Basis Spread on Variable Rate   0.00%  
Macquarie Equipment Finance [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Effective Percentage 3.20% 3.20%  
Debt Instrument, Maturity Date, Description various    
UnsecuredDebt $ 293,400 $ 293,400  
Macquarie Equipment Finance2 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Effective Percentage 1.70% 1.70%  
Long-term borrowings $ 254,800 $ 254,800  
Debt Instrument, Maturity Date, Description various    
Senior Note Payable Due June 2018 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Maturity Date Jun. 30, 2018    
DebtInstrumentFaceAmount $ 750,000 $ 750,000  
DebtInstrumentInterestRateStatedPercentage 2.00% 2.00%  
DebtInstrumentpercentofvalue 99.711% 99.711%  
Senior Note Payable Due February 2018 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Maturity Date Feb. 26, 2018    
DebtInstrumentFaceAmount $ 500,000 $ 500,000  
DebtInstrumentInterestRateStatedPercentage 1.70% 1.70%  
DebtInstrumentpercentofvalue 99.86% 99.86%  
Senior Note Payable Due April 2020 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Maturity Date Apr. 01, 2020    
DebtInstrumentFaceAmount $ 500,000 $ 500,000  
DebtInstrumentInterestRateStatedPercentage 2400.00% 2400.00%  
DebtInstrumentpercentofvalue 99.874% 99.874%