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Fair Value Measurements (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Fair Value Measurements    
Marketable securities $ 322,050 $ 415,273
Auction Rate Securities    
Changes in assets measured at fair value on a recurring basis using significant unobservable inputs (level 3)    
Balance at the beginning of the period 2,309  
Total realized and unrealized gains or (losses) Included in other comprehensive income (14)  
Balance at the end of the period 2,295  
Recurring    
Fair Value Measurements    
Amortized cost of cash and cash equivalents and available for sale securities 493,400 548,000
Fair value of cash and cash equivalents and available for sale securities 493,200 547,500
Recurring | Fair value    
Fair Value Measurements    
Marketable securities 322,050 415,273
Cash, Cash Equivalents and Restricted Cash 182,749 143,857
Other Assets 2,295 2,309
Total Assets Measured at Fair Value 507,094 561,439
Recurring | Fair value | Bonds and bond funds    
Fair Value Measurements    
Marketable securities 313,961 410,163
Recurring | Fair value | Asset-backed Securities    
Fair Value Measurements    
Marketable securities 8,089 5,110
Recurring | Level 1    
Fair Value Measurements    
Cash, Cash Equivalents and Restricted Cash 182,749 143,857
Total Assets Measured at Fair Value 182,749 143,857
Recurring | Level 2    
Fair Value Measurements    
Marketable securities 322,050 415,273
Total Assets Measured at Fair Value 322,050 415,273
Fair Value of Financial Instruments    
Fair value of long-term debt 2,087,100 1,813,100
Carrying amount of long-term debt 2,064,200 1,745,800
Recurring | Level 2 | Bonds and bond funds    
Fair Value Measurements    
Marketable securities 313,961 410,163
Recurring | Level 2 | Asset-backed Securities    
Fair Value Measurements    
Marketable securities 8,089 5,110
Recurring | Level 3    
Fair Value Measurements    
Other Assets 2,295 2,309 [1]
Total Assets Measured at Fair Value $ 2,295 $ 2,309
[1] Comprised of auction rate securities which is reflected in “Other assets” in the Company’s unaudited condensed consolidated balance sheets