Investments - Schedule Of Gains And Losses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended	15 Months Ended
Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013
Investments, Debt and Equity Securities [Abstract]
Net proceeds	$ 9,585	$ 37,861	$ 53,251	$ 19,991
Realized gains (losses)	$ (48)	$ (105)	$ 919	$ 185

This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563

Name:	us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration