Investment Securities (Tables)

12 Months Ended

Dec. 31, 2014

Investments, Debt and Equity Securities [Abstract]

Investment securities consisted of the following (in thousands):



	December 31, 2014									December 31, 2013
	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value (net carrying amount)		Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value (net carrying amount)
Domestic and foreign corporate bonds	$	204,045	$	28	$	(174	)	$	203,899	$	221,418	$	140	$	(124	)	$	221,434
Commercial paper	46,434		1		(21		)	46,414		32,941		16		(3		)	32,954
	$	250,479	$	29	$	(195	)	$	250,313	$	254,359	$	156	$	(127	)	$	254,388

Investments by Contractual Maturity

The fair value of these investment securities at December 31, 2014, by contractual maturity, are as follows (in thousands):



	Fair value
Available-for-sale securities
Due in one year or less	$	240,140
Due after one year through two years	10,173
	$	250,313

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

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