Available-for-Sale-Securities (Notes)

6 Months Ended

Jun. 30, 2014

Available-for-sale Securities [Abstract]

Cash, Cash Equivalents, and Marketable Securities [Text Block]

Available-for-Sale-Securities

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):

	June 30, 2014
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Certificate of deposits	$	744.0	$	—	$	—		$	744.0
Money market funds	21,051.0		—		—			21,051.0
Municipal debt securities	6,581.3		1.1		(0.1		)	6,582.3
Total	$	28,376.3	$	1.1	$	(0.1	)	$	28,377.3

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):

	June 30, 2014
Cash and cash equivalents	$	27,456.5
Marketable securities	920.8
Total	$	28,377.3

The following table summarizes our portfolio of available-for-sale debt securities by contractual maturity (in thousands):

	June 30, 2014
	Amortized Cost		Estimated Fair Value
Less than one year	$	28,376.3	$	28,377.3
Greater than one year	—		—
Total	$	28,376.3	$	28,377.3