The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease.

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 210.5-02.8,17)

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

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

Reinsurance And Trust Agreements (Details) (USD $) In Thousands, unless otherwise specified		0 Months Ended
	Sep. 30, 2014	Apr. 24, 2014 Kilimanjaro Re Limited [Member] item	Apr. 24, 2014 Kilimanjaro Re Limited [Member] Catastrophe Reinsurance Agreement 1 [Member]	Apr. 24, 2014 Kilimanjaro Re Limited [Member] Catastrophe Reinsurance Agreement 2 [Member]
Effects of Reinsurance [Line Items]
Amount on deposit in trust accounts	$ 234,348
Number of collateralized reinsurance agreements		2
Reinsurance coverage amount			250,000	200,000
Catastrophe reinsurance bonds, funded amount		$ 450,000