Investments (Schedule of Available-for-sale Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Investment [Line Items]
Amortized Cost	$ 1,460,566	$ 1,709,922
Gross Unrealized Gains	998	1,030
Gross Unrealized Losses	(3,289)	(3,887)
Fair Value	1,458,275	1,707,065
Agency securities [Member]
Investment [Line Items]
Amortized Cost	373,739	411,963
Gross Unrealized Gains	587	699
Gross Unrealized Losses	(1,202)	(1,169)
Fair Value	373,124	411,493
Corporate securities [Member]
Investment [Line Items]
Amortized Cost	794,901	842,887
Gross Unrealized Gains	278	193
Gross Unrealized Losses	(1,584)	(2,114)
Fair Value	793,595	840,966
Municipal securities [Member]
Investment [Line Items]
Amortized Cost	12,489	9,989
Gross Unrealized Gains	4	3
Gross Unrealized Losses	(1)	(4)
Fair Value	12,492	9,988
Government securities [Member]
Investment [Line Items]
Amortized Cost	279,437	445,083
Gross Unrealized Gains	129	135
Gross Unrealized Losses	(502)	(600)
Fair Value	$ 279,064	$ 444,618

Line items represent reporting concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 12
-Sentence Column A

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

+ References

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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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
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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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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