Junior Subordinated Debt Securities Payable (Narrative) (Details) (USD $)	1 Months Ended
May 24, 2013
Debt Instrument [Line Items]
Amount Issued	$ 329,897,000us-gaap_DebtInstrumentFaceAmount
Early redemption of junior subordinated debt, pre-tax expense	$ 7,282,000
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	6.20%

Face (par) amount of debt instrument at time of issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant