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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2013
Fair Value Measurements  
Schedule of assets measured at fair value on a recurring basis

Assets measured at fair value on a recurring basis are summarized below (in thousands):

 
   Fair Value Measurements as of December 31,
2013		  
 
   Total   Level 1   Level 2   Level 3  

Marketable Securities

                          

Bonds

   $ 487,049   $ —   $ 487,049   $ —  

Asset backed securities

     190     —     190     —  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

     487,239     —     487,239     —  

Cash, Cash Equivalents and Restricted Cash

   $ 182,855     182,855     —     —  

Other Assets(a)

     2,245     —     —     2,245  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total Assets Measured at Fair Value

   $ 672,339   $ 182,855   $ 487,239   $ 2,245  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   


 

 
   Fair Value Measurements as of December 31,
2012		  
 
   Total   Level 1   Level 2   Level 3  

Marketable Securities

                          

Bonds

   $ 552,289   $ —   $ 552,289   $ —  

Commercial paper

     3,514     —     3,514     —  

Asset backed securities

     314     —     314     —  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

     556,117     —     556,117     —  

Cash, Cash Equivalents and Restricted Cash

     153,325     153,325     —     —  

Other Assets(a)

     3,844     —     —     3,844  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total Assets Measured at Fair Value

   $ 713,286   $ 153,325   $ 556,117   $ 3,844  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   
(a)
Auction rate securities included in "Other assets" in the Consolidated Balance Sheet
Schedule of fair value measurements using significant unobservable inputs

The following table presents the Company's assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) at December 31, 2013 (in thousands):

Fair Value Measurements Using Significant Unobservable Inputs

(Level 3)

 
   Auction Rate
Securities		  

Balance at January 1, 2013

   $ 3,844  

Total realized and unrealized gains or (losses)

        

Included in earnings

     —  

Included in other comprehensive income

     (71 )

Transferred out

     —  

Settlements

     (1,528 )
       
​ ​ ​ ​ ​

Balance at December 31, 2013

   $ 2,245  
       
​ ​ ​ ​ ​
​ ​ ​ ​ ​