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Summary of Significant Accounting Policies - Restricted Cash, Cash Equivalents and Investments (Details)
12 Months Ended
Dec. 31, 2013
Minimum
 
Restricted Cash and Cash Equivalents Items [Line Items]  
U.S. Treasury Security Maturity Term 6 months
Maximum
 
Restricted Cash and Cash Equivalents Items [Line Items]  
U.S. Treasury Security Maturity Term 12 months