The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of other investments classified as trading.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 10
-Section 45
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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The fair value of trading securities that serve as collateral for borrowings.

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The amount of capital commitment in a limited partnership that is also a related party.

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The required percentage of market value that is required as collateral for securities loaned pursuant to the Company's securities lending program. Collateral must be received in the form of cash, government securities and letters of credit and is held by a third party.

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Investments (Narrative) (Details) $ in Thousands		12 Months Ended
Investments (Narrative) (Details) $ in Thousands	Nov. 07, 2014 USD ($)	Dec. 31, 2016 USD ($) funds	Dec. 31, 2015 USD ($)
Schedule of Trading Securities and Other Trading Assets [Line Items]
Investments pledged as collateral		$ 442,184	$ 826,535
Other investments		$ 405,712	336,856
Securities lending - Percent of market value required in collateral		102.00%
Cash, cash equivalents and investments pledged as collateral		$ 5,173,966	4,056,788
Investments held in trust		5,068,092	4,007,215
Managed investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments		405,712	336,856
Managed investments \| Fixed income investment funds
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments		$ 242,093	188,721
Managed investments \| Subject to redemption restriction \| Fixed income investment funds
Schedule of Trading Securities and Other Trading Assets [Line Items]
Lock Up Period		3 years
Other investments		$ 184,749
Recurring \| Managed investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments		405,712	336,856
Recurring \| Managed investments \| Fixed income investment funds
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments		242,093	188,721
Recurring \| Managed investments \| Subject to redemption restriction
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments		$ 369,402	308,562
Recurring \| Managed investments \| Subject to redemption restriction \| Investment fund A [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other Investments Number Of Funds \| funds		1
Recurring \| Managed investments \| Subject to redemption restriction \| Fixed income investment funds
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments		$ 211,151	$ 167,910
Aquiline Financial Services Fund III LP
Schedule of Trading Securities and Other Trading Assets [Line Items]
Capital commitment	$ 100,000