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Investments
 12 Months Ended
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]  
Investments
5. INVESTMENTS
The Company’s investments in available-for-sale marketable securities are made within the guidelines of its investment policy, which has established guidelines relative to the diversification of the Company’s investments and their maturities, with the principle objective of capital preservation and maintaining liquidity that is sufficient to meet cash flow requirements.
 The following is a summary of investments, including cash equivalents, as of December 31, 2013 (in thousands):
 
December 31, 2013
 
Amortized Cost Basis
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Money market funds
$
65,700

 
$
—

 
$
—

 
$
65,700

Corporate bonds
78,488

 
121

 
—

 
78,609

Agency bonds
121,307

 
14

 
(5
)
 
121,316

 
$
265,495

 
$
135

 
$
(5
)
 
$
265,625


The Company’s investment in marketable securities had a weighted-average maturity date of approximately seven months. Unrealized gains and losses on investments were not significant, and the Company does not believe the unrealized losses represent other-than-temporary impairments as of December 31, 2013.