Investments (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Investments [Abstract]
Trading Securities, Change in Unrealized Holding Gain (Loss)	$ (400,000)	$ (200,000)	$ (500,000)	$ (700,000)
Investment [Line Items]
% of Total			100.00%		100.00%
Impaired Financing Receivable, Recorded Investment	0		$ 0		$ 0
Impaired Financing Receivable, Related Allowance	0		0		0
Gross unrealized losses related to high or highest quality securities	14,700,000		14,700,000		4,000,000
Gross unrealized losses related to other than high or highest quality securities	8,200,000		8,200,000		3,100,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	8,500,000		8,500,000		1,200,000
Commercial Loan on Hospitality
Investment [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	0		0		$ 0
All other corporate securities
Investment [Line Items]
Securities Loaned, Including Not Subject To Master Netting Arrangement And Assets Other Than Securities Transferred	$ 10,000,000		$ 10,000,000
California
Investment [Line Items]
% of Total			18.00%
Texas
Investment [Line Items]
% of Total			12.00%