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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Investment [Line Items]
Total fixed maturity investments trading	$ 7,282,264	$ 6,891,244
U.S. treasuries
Investment [Line Items]
Total fixed maturity investments trading	2,826,681	2,617,894
Agencies
Investment [Line Items]
Total fixed maturity investments trading	83,343	90,972
Municipal
Investment [Line Items]
Total fixed maturity investments trading	518,912	519,069
Non-U.S. government (Sovereign debt)
Investment [Line Items]
Total fixed maturity investments trading	173,667	333,224
Non-U.S. government-backed corporate
Investment [Line Items]
Total fixed maturity investments trading	74,620	133,300
Corporate
Investment [Line Items]
Total fixed maturity investments trading	2,186,040	1,877,243
Agency mortgage-backed
Investment [Line Items]
Total fixed maturity investments trading	567,560	462,493
Non-agency mortgage-backed
Investment [Line Items]
Total fixed maturity investments trading	275,268	258,944
Commercial mortgage-backed
Investment [Line Items]
Total fixed maturity investments trading	384,610	409,747
Asset-backed
Investment [Line Items]
Total fixed maturity investments trading	$ 191,563	$ 188,358

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- Definition

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.

+ References

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 investments in debt securities classified as trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.4)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.(a),1)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562

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