Securities Available for Sale (Tables)

3 Months Ended

Mar. 31, 2016

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 March 31, 2016 and December 31, 2015, were as follows:

March 31, 2016	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Corporate debt securities	$	209,955	$	93	$	(877	)	$	209,171
Asset-backed securities	48,116		5		(42		)	48,079
U.S. agency securities	16,602		2		(21		)	16,583
U.S. Treasury securities	3,490		26		—			3,516
Other securities	7,005		—		(54		)	6,951
Total securities available for sale	$	285,168	$	126	$	(994	)	$	284,300
December 31, 2015	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Corporate debt securities	$	217,243	$	2	$	(1,494	)	$	215,751
Asset-backed securities	54,543		—		(134		)	54,409
U.S. agency securities	16,602		1		(25		)	16,578
U.S. Treasury securities	3,489		—		(4		)	3,485
Other securities	7,005		—		(17		)	6,988
Total securities available for sale	$	298,882	$	3	$	(1,674	)	$	297,211

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

A summary of securities available for sale with unrealized losses as of March 31, 2016 and December 31, 2015, aggregated by period of continuous unrealized loss, is as follows:

	Less than 12 months					12 months or longer				Total
March 31, 2016	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Corporate debt securities	$	166,436	$	(877	)	$	—	$	—	$	166,436	$	(877	)
Asset-backed securities	35,235		(42		)	—		—		35,235		(42		)
U.S. agency securities	14,582		(21		)	—		—		14,582		(21		)
Other securities	6,950		(54		)	—		—		6,950		(54		)
Total securities with unrealized losses(1)	$	223,203	$	(994	)	$	—	$	—	$	223,203	$	(994	)
	Less than 12 months					12 months or longer				Total
December 31, 2015	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Corporate debt securities	$	212,018	$	(1,494	)	$	—	$	—	$	212,018	$	(1,494	)
Asset-backed securities	54,409		(134		)	—		—		54,409		(134		)
U.S. agency securities	14,578		(25		)	—		—		14,578		(25		)
U.S. Treasury securities	3,485		(4		)	—		—		3,485		(4		)
Other securities	6,988		(17		)	—		—		6,988		(17		)
Total securities with unrealized losses(1)	$	291,478	$	(1,674	)	$	—	$	—	$	291,478	$	(1,674	)

⁽¹⁾  The number of investment positions with unrealized losses at March 31, 2016 and December 31, 2015 totaled 109 and 141, respectively.

Available-for-sale Securities by Contractual Maturity

The contractual maturities of securities available for sale at March 31, 2016, were as follows:

	Within 1 year		After 1 year through 5 years		After 5 years through 10 years		After 10 years		Total
Corporate debt securities	$	48,374	$	160,797	$	—	$	—	$	209,171
Asset-backed securities	1,221		46,858		—		—		48,079
U.S. agency securities	—		16,583		—		—		16,583
U.S. Treasury securities	1,000		2,516		—		—		3,516
Other securities	1,999		4,952		—		—		6,951
Total fair value	$	52,594	$	231,706	$	—	$	—	$	284,300
Total amortized cost	$	52,648	$	232,520	$	—	$	—	$	285,168