Investments (Schedule of Available-for-sale Securities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Investment [Line Items]
Amortized Cost	$ 1,564,885	$ 1,602,904
Gross Unrealized Gains	2,465	1,582
Gross Unrealized Losses	(669)	(2,116)
Fair Value	1,566,681us-gaap_AvailableForSaleSecurities	1,602,370us-gaap_AvailableForSaleSecurities
Agency Securities [Member]
Investment [Line Items]
Amortized Cost	617,874	637,474
Gross Unrealized Gains	1,573	1,296
Gross Unrealized Losses	(98)	(457)
Fair Value	619,349	638,313
Corporate Securities [Member]
Investment [Line Items]
Amortized Cost	777,546	795,255
Gross Unrealized Gains	605	232
Gross Unrealized Losses	(562)	(1,372)
Fair Value	777,589	794,115
Municipal Securities [Member]
Investment [Line Items]
Amortized Cost	39,098	48,744
Gross Unrealized Gains	68	17
Gross Unrealized Losses	(8)	(31)
Fair Value	39,158	48,730
Government Securities [Member]
Investment [Line Items]
Amortized Cost	130,367	121,431
Gross Unrealized Gains	219	37
Gross Unrealized Losses	(1)	(256)
Fair Value	$ 130,585	$ 121,212

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

No definition available.

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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

No definition available.

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- Definition

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=28360136&loc=d3e22054-111558

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ 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)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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