Investments - Investments Classified as Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 177,280	$ 199,429
Gross Unrealized Gains	5,967	0
Gross Unrealized Losses	1,886	1,117
Fair Value	181,361	198,312
U.S. Treasury securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		184,819
Gross Unrealized Gains		0
Gross Unrealized Losses		79
Fair Value		184,740
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	135,590	7,273
Gross Unrealized Gains	5,311	0
Gross Unrealized Losses	1,769	981
Fair Value	139,132	6,292
Preferred stock
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	36,048	265
Gross Unrealized Gains	656	0
Gross Unrealized Losses	111	57
Fair Value	36,593	208
Debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	171,638	192,357
Gross Unrealized Gains	5,967	0
Gross Unrealized Losses	1,880	1,117
Fair Value	175,725	191,240
Short-term bond
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,232
Gross Unrealized Gains	0
Gross Unrealized Losses	6
Fair Value	4,226
Restricted investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,642
Gross Unrealized Gains	0
Gross Unrealized Losses	6
Fair Value	5,636
Money market fund
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,410	7,072
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 1,410	$ 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=65884222&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=73527792&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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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
-SubTopic 10
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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.

+ References

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
-Subparagraph (SX 210.5-02.2)
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