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Investments (Fixed Income Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Schedule of Held-to-maturity Securities [Line Items] |  |
Due in one year or less fair value | $ 306,493 |
Due after one year through five years fair value | 2,095,055 |
Due after five years through 10 years fair value | 2,379,624 |
Due after ten years fair value | 237,550 |
AFS, Fair Value | 5,018,722 | $ 4,792,540
Due in one year or less carrying value | 34,521 |
Due after one year through five years carrying value | 29,648 |
Due after five years through 10 years carrying value | 8,345 |
Due after 10 years carrying value | 0 |
Carrying Value | 72,514 | 101,556
Due in one year or less fair value | 34,898 |
Due after one year through five years fair value | 31,498 |
Due after five years through 10 years fair value | 9,144 |
Due after 10 years fair value | 0 |
HTM, Fair Value | $ 75,540 | $ 105,211

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- Definition Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563 + Details
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