Investments (Schedule Of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Investment [Line Items]
Amortized Cost	$ 1,397,439	$ 1,602,904
Gross Unrealized Gains	870	1,582
Gross Unrealized Losses	(3,493)	(2,116)
Fair Value	1,394,816	1,602,370
Agency securities
Investment [Line Items]
Amortized Cost	530,981	637,474
Gross Unrealized Gains	757	1,296
Gross Unrealized Losses	(1,216)	(457)
Fair Value	530,522	638,313
Corporate securities
Investment [Line Items]
Amortized Cost	699,210	795,255
Gross Unrealized Gains	90	232
Gross Unrealized Losses	(1,929)	(1,372)
Fair Value	697,371	794,115
Municipal securities
Investment [Line Items]
Amortized Cost	14,872	48,744
Gross Unrealized Gains	14	17
Gross Unrealized Losses	(8)	(31)
Fair Value	14,878	48,730
Government securities
Investment [Line Items]
Amortized Cost	152,376	121,431
Gross Unrealized Gains	9	37
Gross Unrealized Losses	(340)	(256)
Fair Value	$ 152,045	$ 121,212

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=51813488&loc=d3e22054-111558

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