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Marketable Securities
 12 Months Ended
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
Marketable Securities
Marketable securities as of December 31, 2016 and 2015 consist of both debt securities of investment grade issuers as well as equity securities.
The following tables summarize the Company's investments in marketable securities:
 
 
Amortized
 
Unrealized
 
Fair
As of December 31, 2016
 
Cost Basis
 
Gains
 
Losses
 
Value
Corporate bonds
 
$
1,076,964

 
$
630

 
$
(4,743
)
 
$
1,072,851

U.S. government and government agency obligations
 
132,923

 
58

 
(641
)
 
132,340

Municipal bonds
 
7,663

 
1

 
(20
)
 
7,644

Commercial paper
 
63,074

 
1

 
—

 
63,075

Certificates of deposit
 
42,612

 
—

 
—

 
42,612

Equity securities
 
57,251

 
5,551

 
(13,583
)
 
49,219

 
 
$
1,380,487

 
$
6,241

 
$
(18,987
)
 
$
1,367,741

As of December 31, 2015
 
 
 
 
 
 
 
 
Corporate bonds
 
$
770,092

 
$
156

 
$
(2,565
)
 
$
767,683

U.S. government and government agency obligations
 
51,402

 
—

 
(193
)
 
51,209

Municipal bonds
 
17,930

 
5

 
(11
)
 
17,924

Equity securities
 
17,005

 
14,462

 
—

 
31,467

 
 
$
856,429

 
$
14,623

 
$
(2,769
)
 
$
868,283

The Company classifies its debt security investments based on their contractual maturity dates. The debt securities listed as of December 31, 2016 mature at various dates through November 2021. The fair values of debt security investments by contractual maturity consist of the following:
 
 
As of December 31,
 
 
2016
 
2015
Maturities within one year
 
$
503,482

 
$
236,121

Maturities after one year through five years
 
815,040

 
600,695

 
 
$
1,318,522

 
$
836,816

The following table shows the fair value of the Company's marketable securities that have unrealized losses and that are deemed to be only temporarily impaired, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position.
 
Less than 12 Months
 
12 Months or Greater
 
Total
As of December 31, 2016
Fair Value
 
Unrealized Loss
 
Fair Value
 
Unrealized Loss
 
Fair Value
 
Unrealized Loss
Corporate bonds
$
759,222

 
$
(4,685
)
 
$
36,407

 
$
(58
)
 
$
795,629

 
$
(4,743
)
U.S. government and government agency obligations
81,170

 
(641
)
 
—

 
—

 
81,170

 
(641
)
Municipal bonds
7,141

 
(20
)
 
—

 
—

 
7,141

 
(20
)
Equity securities
36,417

 
(13,583
)
 
—

 
—

 
36,417

 
(13,583
)
 
$
883,950

 
$
(18,929
)
 
$
36,407

 
$
(58
)
 
$
920,357

 
$
(18,987
)
 
 
 
 
 
 
 
 
 
 
 
 
As of December 31, 2015
 
 
 
 
 
 
 
 
 
 
 
Corporate bonds
$
668,199

 
$
(2,473
)
 
$
23,749

 
$
(92
)
 
$
691,948

 
$
(2,565
)
U.S. government and government agency obligations
51,215

 
(193
)
 
—

 
—

 
51,215

 
(193
)
Municipal bonds
11,917

 
(11
)
 
—

 
—

 
11,917

 
(11
)
 
$
731,331

 
$
(2,677
)
 
$
23,749

 
$
(92
)
 
$
755,080

 
$
(2,769
)

During the year ended December 31, 2016, the Company recorded an other-than-temporary impairment charge of $9.8 million related to its investment in an equity security. There were no other-than-temporary impairment charges recorded on the Company's investments during 2015 or 2014. Realized gains and losses on sales of marketable securities were not material for the years ended December 31, 2016 and 2015. For the year ended December 31, 2014, total realized gains on sales of marketable securities were not material and there were no realized losses.
Changes in the Company's accumulated other comprehensive income (loss) for the years ended December 31, 2016, 2015, and 2014 related to unrealized gains and losses on available-for-sale marketable securities. For the years ended December 31, 2016, 2015, and 2014, amounts reclassified from accumulated other comprehensive income (loss) into other income (expense), net in the Company's Consolidated Statements of Operations were related to the 2016 impairment charge on the equity security and realized gains and losses on sales of marketable securities described above.