Ceded Reinsurance (Narrative) (Details)	12 Months Ended
	Dec. 31, 2014 reinsurers	Dec. 31, 2013	Dec. 31, 2012
Concentration Risk [Line Items]
Percentage of reinsurance recoverable	100.00%	100.00%
Credit concentration risk | Premiums ceded
Concentration Risk [Line Items]
Number of ceded reinsurers	4
Concentration risk, percentage	42.00%	45.00%	48.00%
Credit concentration risk | Reinsurance recoverable | A- or better rating
Concentration Risk [Line Items]
Percentage of reinsurance recoverable	99.00%