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Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2013
Investments, Debt and Equity Securities [Abstract]  
Summary of Marketable Securities
The following is a summary of marketable securities at June 30, 2013 and December 31, 2012 (in thousands):
 
 
June 30, 2013
 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair
Values
Available-for-sale securities
 
 
 
 
 
 
 
Corporate bonds and notes
$
133,045

 
$
46

 
$
(143
)
 
$
132,948

Municipal bonds and notes
118,262

 
32

 
(38
)
 
118,256

Commercial paper
44,800

 
7

 
(1
)
 
44,806

Treasury and agency notes and bills
17,402

 
—

 
(11
)
 
17,391

Money market funds
15,834

 
—

 
—

 
15,834

Certificate of deposit
3,500

 
1

 
—

 
3,501

Total available-for-sale securities
$
332,843

 
$
86

 
$
(193
)
 
$
332,736

Reported in:
 
 
 
 
 
 
 
Cash and cash equivalents
 
 
 
 
 
 
$
29,002

Short-term investments
 
 
 
 
 
 
303,734

Total marketable securities
 
 
 
 
 
 
$
332,736

 
December 31, 2012
 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair
Values
Available-for-sale securities
 
 
 
 
 
 
 
Corporate bonds and notes
$
171,485

 
$
177

 
$
(98
)
 
$
171,564

Municipal bonds and notes
110,185

 
55

 
(32
)
 
110,208

Treasury and agency notes and bills
29,050

 
12

 
(4
)
 
29,058

Commercial paper
46,135

 
12

 
(4
)
 
46,143

Money market funds
34,106

 
—

 
—

 
34,106

Certificate of deposit
4,503

 
1

 
—

 
4,504

Total available-for-sale securities
$
395,464

 
$
257

 
$
(138
)
 
$
395,583

Reported in:
 
 
 
 
 
 
 
Cash and cash equivalents
 
 
 
 
 
 
$
56,782

Short-term investments
 
 
 
 
 
 
338,801

Total marketable securities
 
 
 
 
 
 
$
395,583
Schedule of Gross Unrealized Losses on Investments
The following table summarizes the fair value and gross unrealized losses related to individual available-for-sale securities at June 30, 2013 and December 31, 2012, which have been in a continuous unrealized loss position, aggregated by investment category and length of time (in thousands):
 
June 30, 2013
Less Than 12 Months
 
12 Months or More
 
Total
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
Corporate bonds and notes
$
80,004

 
$
(143
)
 
$
—

 
$
—

 
$
80,004

 
$
(143
)
Municipal bonds and notes
45,167

 
(38
)
 
—

 
—

 
45,167

 
(38
)
Treasury and agency notes and bills
11,485

 
(11
)
 
—

 
—

 
11,485

 
(11
)
Commercial paper
17,644

 
(1
)
 
—

 
 
 
17,644

 
(1
)
Total
$
154,300

 
$
(193
)
 
$
—

 
$
—

 
$
154,300

 
$
(193
)
 
December 31, 2012
Less Than 12 Months
 
12 Months or More
 
Total
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
Corporate bonds and notes
$
60,620

 
$
(98
)
 
$
—

 
$
—

 
$
60,620

 
$
(98
)
Municipal bonds and notes
48,149

 
(32
)
 
—

 
—

 
48,149

 
(32
)
Commercial paper
10,567

 
(4
)
 
—

 
—

 
10,567

 
(4
)
Certificate of deposit
3,500

 
(1
)
 
 
 
 
 
3,500

 
(1
)
Treasury and agency notes and bills
2,997

 
(3
)
 
—

 
—

 
2,997

 
(3
)
Total
$
125,833

 
$
(138
)
 
$
—

 
$
—

 
$
125,833

 
$
(138
)
Estimated Fair Value of Marketable Securities by Contractual Maturity
The estimated fair value of marketable securities by contractual maturity at June 30, 2013 is shown below (in thousands). Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations without call or prepayment penalties.
 
 
Estimated
Fair Value
Due in one year or less
$
242,313

Due in one to two years
90,423

Total
$
332,736