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Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 204,205	$ 142,882
Gross unrealized gains	103	44
Gross unrealized losses	(85)	(49)
Fair value	204,223	142,877
Government-sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	37,645	22,055
Gross unrealized gains	10	1
Gross unrealized losses	0	(9)
Fair value	37,655	22,047
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	166,560	111,473
Gross unrealized gains	93	42
Gross unrealized losses	(85)	(34)
Fair value	$ 166,568	111,481
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost		9,354
Gross unrealized gains		1
Gross unrealized losses		(6)
Fair value		$ 9,349

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- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

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-Publisher FASB
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