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Cash and Cash Equivalents and Investments in Marketable Securities (Tables)
 3 Months Ended
Mar. 31, 2013
Cash And Cash Equivalents And Investments In Marketable Securities [Abstract]  
Available-For-Sale Securities
The following is a summary of our available-for-sale securities:
 
 
Amortized Cost
 
Gross Unrealized Gain
 
Gross Unrealized Loss
 
Fair Value
(Net Carrying Amount)
 
 
(In thousands)
March 31, 2013
 
 
 
 
 
 
 
 
Certificates of deposit
 
$
81,771

 
$
9

 
$
(4
)
 
$
81,776

Commercial paper
 
51,541

 
27

 
—

 
51,568

Corporate debt securities
 
69,806

 
4

 
(38
)
 
69,772

State and political subdivisions debt securities
 
467,583

 
29

 
(34
)
 
467,578

Total marketable securities
 
$
670,701

 
$
69

 
$
(76
)
 
$
670,694

 
 
 
 
 
 
 
 
 
December 31, 2012
 
 
 
 
 
 
 
 
Certificates of deposit
 
$
82,791

 
$
14

 
$
(6
)
 
$
82,799

Commercial paper
 
45,737

 
17

 
—

 
45,754

Corporate debt securities
 
49,587

 
2

 
(30
)
 
49,559

State and political subdivisions debt securities
 
457,615

 
26

 
(51
)
 
457,590

Total marketable securities
 
$
635,730

 
$
59

 
$
(87
)
 
$
635,702