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Investments (Tables)
 12 Months Ended
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
 
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