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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2014
Fair Value
Level 1
Dec. 31, 2013
Fair Value
Level 1
Jun. 30, 2014
Fair Value
Level 1
Retail
Dec. 31, 2013
Fair Value
Level 1
Retail
Jun. 30, 2014
Fair Value
Level 2
Institutional and Other
Dec. 31, 2013
Fair Value
Level 2
Institutional and Other
Jun. 30, 2014
Fair Value
U.S. Treasury Notes
Level 1
Dec. 31, 2013
Fair Value
U.S. Treasury Notes
Level 1
Jun. 30, 2014
Book Value
Dec. 31, 2013
Book Value
Jun. 30, 2014
Book Value
Retail
Dec. 31, 2013
Book Value
Retail
Jun. 30, 2014
Book Value
Institutional and Other
Dec. 31, 2013
Book Value
Institutional and Other
Jun. 30, 2014
Book Value
U.S. Treasury Notes
Dec. 31, 2013
Book Value
U.S. Treasury Notes
Jun. 30, 2014
Institutional and Other
Minimum
Jun. 30, 2014
Institutional and Other
Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions                                            
Cash and cash equivalents $ 874,860 $ 830,014 $ 1,246,415 $ 740,481 $ 874,860 $ 830,014             $ 874,860 $ 830,014                
Short-term investments 40,035 50,104                 40,035 50,104             40,035 50,104    
Long-term debt             $ 1,177,723 $ 1,048,010 $ 555,775 $ 512,635         $ 1,178,250 $ 1,178,250 $ 537,691 $ 537,454        
Fair value assumption, interest rate                                         0.00% 6.59%