Investments - Schedule of Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 200,392	$ 199,429
Gross Unrealized Gains	30	0
Gross Unrealized Losses	1,234	1,117
Fair Value	199,188	198,312
U.S. Treasury securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	184,930	184,819
Gross Unrealized Gains	19	0
Gross Unrealized Losses	0	79
Fair Value	184,949	184,740
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,546	7,273
Gross Unrealized Gains	11	0
Gross Unrealized Losses	1,117	981
Fair Value	8,440	6,292
Preferred stock
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	265	265
Gross Unrealized Gains	0	0
Gross Unrealized Losses	117	57
Fair Value	148	208
Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	194,741	192,357
Gross Unrealized Gains	30	0
Gross Unrealized Losses	1,234	1,117
Fair Value	193,537	191,240
Money market fund
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,651
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	$ 5,651
Guaranteed income fund
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		7,072
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		$ 7,072

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
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-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 45
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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