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Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 152,444	$ 142,882
Gross unrealized gains	61	44
Gross unrealized losses	(9)	(49)
Fair value	152,496	142,877
Government-sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	28,662	22,055
Gross unrealized gains	10	1
Gross unrealized losses	0	(9)
Fair value	28,672	22,047
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	114,475	111,473
Gross unrealized gains	47	42
Gross unrealized losses	(9)	(34)
Fair value	114,513	111,481
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	9,307	9,354
Gross unrealized gains	4	1
Gross unrealized losses	0	(6)
Fair value	$ 9,311	$ 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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