Investments (Schedule of Available-for-sale Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Investment [Line Items]
Amortized Cost	$ 1,619,577	$ 1,709,922
Gross Unrealized Gains	1,200	1,030
Gross Unrealized Losses	(2,932)	(3,887)
Fair Value	1,617,845	1,707,065
Agency securities [Member]
Investment [Line Items]
Amortized Cost	483,398	411,963
Gross Unrealized Gains	557	699
Gross Unrealized Losses	(1,297)	(1,169)
Fair Value	482,658	411,493
Corporate securities [Member]
Investment [Line Items]
Amortized Cost	802,969	842,887
Gross Unrealized Gains	576	193
Gross Unrealized Losses	(1,065)	(2,114)
Fair Value	802,480	840,966
Municipal securities [Member]
Investment [Line Items]
Amortized Cost	3,965	9,989
Gross Unrealized Gains	12	3
Gross Unrealized Losses	0	(4)
Fair Value	3,977	9,988
Government securities [Member]
Investment [Line Items]
Amortized Cost	329,245	445,083
Gross Unrealized Gains	55	135
Gross Unrealized Losses	(570)	(600)
Fair Value	$ 328,730	$ 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=75030427&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
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-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
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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
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-Name Accounting Standards Codification
-Topic 320
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-Section 50
-Paragraph 2
-Subparagraph (c)
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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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