Securities Available for Sale (Tables)

9 Months Ended

Sep. 30, 2015

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-sale Securities Reconciliation

The amortized cost, gross unrealized gains and losses, and fair value of securities available for sale as of September 30, 2015, are as follows:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Corporate debt securities	$	251,253	$	4	$	(1,144	)	$	250,113
Asset-backed securities	54,990		4		(35		)	54,959
U.S. agency securities	20,602		5		(4		)	20,603
Municipal securities	5,840		3		—			5,843
Other securities	7,006		1		(6		)	7,001
Total securities available for sale	$	339,691	$	17	$	(1,189	)	$	338,519

Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value

A summary of securities available for sale with unrealized losses as of September 30, 2015, aggregated by category and period of continuous unrealized loss, is as follows:

	Less than 12 months					12 months or longer				Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Corporate debt securities	$	241,480	$	(1,144	)	$	—	$	—	$	241,480	$	(1,144	)
Asset-backed securities	49,955		(35		)	—		—		49,955		(35		)
U.S. agency securities	11,600		(4		)	—		—		11,600		(4		)
Other securities	4,999		(6		)	—		—		4,999		(6		)
Total securities with unrealized losses(1)	$	308,034	$	(1,189	)	$	—	$	—	$	308,034	$	(1,189	)

⁽¹⁾  The number of investment positions with unrealized losses totaled 142.

Available-for-sale Securities

The contractual maturities of securities available for sale at September 30, 2015, are as follows:

	Within 1 year		After 1 year through 5 years		After 5 years through 10 years		After 10 years		Total
Corporate debt securities	$	28,120	$	221,993	$	—	$	—	$	250,113
Asset-backed securities	—		54,959		—		—		54,959
U.S. agency securities	—		20,603		—		—		20,603
Municipal securities	—		5,843		—		—		5,843
Other securities	—		7,001		—		—		7,001
Total fair value	$	28,120	$	310,399	$	—	$	—	$	338,519
Total amortized cost	$	28,151	$	311,540	$	—	$	—	$	339,691

Schedule of Realized Gain (Loss)

Proceeds and gross realized gains and losses from sales of securities available for sale are as follows:

	Three Months Ended September 30,		Nine Months Ended September 30,
	2015		2015
Proceeds	$	59,689	$	63,198
Gross realized gains	$	58	$	58
Gross realized losses	$	—	$	1