Investments (Schedule Of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investment [Line Items]
Amortized Cost	$ 1,710,072	$ 1,397,439
Gross Unrealized Gains	1,030	870
Gross Unrealized Losses	(3,887)	(3,493)
Fair Value	1,707,215	1,394,816
Agency securities
Investment [Line Items]
Amortized Cost	411,963	530,981
Gross Unrealized Gains	699	757
Gross Unrealized Losses	(1,169)	(1,216)
Fair Value	411,493	530,522
Corporate securities
Investment [Line Items]
Amortized Cost	843,037	699,210
Gross Unrealized Gains	193	90
Gross Unrealized Losses	(2,114)	(1,929)
Fair Value	841,116	697,371
Municipal securities
Investment [Line Items]
Amortized Cost	9,989	14,872
Gross Unrealized Gains	3	14
Gross Unrealized Losses	(4)	(8)
Fair Value	9,988	14,878
Government securities
Investment [Line Items]
Amortized Cost	445,083	152,376
Gross Unrealized Gains	135	9
Gross Unrealized Losses	(600)	(340)
Fair Value	$ 444,618	$ 152,045

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
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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
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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-Name Accounting Standards Codification
-Topic 320
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-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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-Paragraph 2
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 1
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