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Availabe-for-Sale-Securities schedule of available-for-Sales (Tables)
 12 Months Ended
Dec. 31, 2014
Available-for-sale Securities [Abstract]  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
The following table is a summary of available-for-sale securities recorded in cash and cash equivalents or marketable securities in our Consolidated Balance Sheets (in thousands):

 
December 31, 2014
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
Certificate of deposits
$
249.0

 
$
—

 
$
—

 
$
249.0

Money market funds
12,791.9

 
—

 
—

 
12,791.9

Municipal debt securities
9,317.3

 
1.3

 
—

 
9,318.6

Total
$
22,358.2

 
$
1.3

 
$
—

 
$
22,359.5
Marketable Securities [Table Text Block]
Estimated fair values of available-for-sale securities are generally based on prices obtained from commercial pricing services. The following table summarizes the classification of the available-for-sale debt securities on our Consolidated Balance Sheets (in thousands):

 
December 31, 2014
Cash and cash equivalents
$
15,279.4

Marketable securities
7,080.1

Total
$
22,359.5
Investments Classified by Contractual Maturity Date [Table Text Block]
The following table summarizes our portfolio of available-for-sale debt securities by contractual maturity (in thousands):
 
 
December 31, 2014
 
Amortized Cost
 
Estimated Fair Value
Less than one year
$
22,358.2

 
$
22,359.5

Greater than one year
—

 
—

Total
$
22,358.2

 
$
22,359.5