Reinsurance (Reinsurance Recoverable) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Ceded Credit Risk [Line Items]
Reinsurance recoverables	$ 7,470,403	$ 7,254,585
Ceded future policyholder benefits and expense
Ceded Credit Risk [Line Items]
Reinsurance recoverables	4,037,682	4,052,976
Ceded unearned premium
Ceded Credit Risk [Line Items]
Reinsurance recoverables	1,667,228	1,587,583
Ceded claims and benefits payable
Ceded Credit Risk [Line Items]
Reinsurance recoverables	1,429,128	1,283,510
Ceded paid losses
Ceded Credit Risk [Line Items]
Reinsurance recoverables	$ 336,365	$ 330,516

Amount after valuation allowance recoverable including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 20
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6824-158387

Reference 2: 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),6)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 6
-Article 7

Name:	us-gaap_ReinsuranceRecoverables
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant