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Summary of Significant Accounting Policies - Fair Value (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Held-to-maturity Securities $ 14,800,000 $ 14,400,000
Promissory Notes 9,500,000 4,000,000
Long-term Debt 4,380,100,000 1,440,500,000
Fair Value Measurements, Nonrecurring | Estimate of Fair Value, Fair Value Disclosure
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Held-to-maturity Securities, Fair Value Disclosure 30,100,000 14,400,000
Promissory Notes, Fair Value Disclosure 16,500,000 4,000,000
Long-term Debt, Fair Value Disclosure 4,511,900,000 1,532,100,000
Fair Value Measurements, Nonrecurring | Fair Value, Inputs, Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Held-to-maturity Securities, Fair Value Disclosure 0 0
Promissory Notes, Fair Value Disclosure 0 0
Long-term Debt, Fair Value Disclosure 0 0
Fair Value Measurements, Nonrecurring | Fair Value, Inputs, Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Held-to-maturity Securities, Fair Value Disclosure 26,700,000 9,900,000
Promissory Notes, Fair Value Disclosure 16,500,000 4,000,000
Long-term Debt, Fair Value Disclosure 4,511,900,000 1,532,100,000
Fair Value Measurements, Nonrecurring | Fair Value, Inputs, Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Held-to-maturity Securities, Fair Value Disclosure 3,400,000 4,500,000
Promissory Notes, Fair Value Disclosure 0 0
Long-term Debt, Fair Value Disclosure 0 0
Fair Value Measurements, Recurring | Estimate of Fair Value, Fair Value Disclosure
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Deferred Compensation, Fair Value Disclosure 800,000 1,000,000
Fair Value Measurements, Recurring | Fair Value, Inputs, Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Deferred Compensation, Fair Value Disclosure 800,000 1,000,000
Fair Value Measurements, Recurring | Fair Value, Inputs, Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Deferred Compensation, Fair Value Disclosure 0 0
Fair Value Measurements, Recurring | Fair Value, Inputs, Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Deferred Compensation, Fair Value Disclosure $ 0 $ 0