Reinsurance Reinsurance (Ceded Reinsurance Receivable Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 637,859	$ 578,206
Reinsurance Recoverables, Percentage of Total	100.00%	100.00%
Other Reinsurers [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 107,077	$ 160,285
Reinsurance Recoverables, Percentage of Total	16.80%	27.60%
AM Best, A+ Rating [Member] | Reinsurer A [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 199,479	$ 45,541
Reinsurance Recoverables, Percentage of Total	31.30%	7.90%
AM Best, A+ Rating [Member] | Reinsurer B [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 179,522	$ 210,996
Reinsurance Recoverables, Percentage of Total	28.10%	36.50%
AM Best, A+ Rating [Member] | Reinsurer C [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 72,836	$ 74,412
Reinsurance Recoverables, Percentage of Total	11.40%	12.90%
AM Best, A++ Rating [Member] | Reinsurer D [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 41,807	$ 43,154
Reinsurance Recoverables, Percentage of Total	6.60%	7.50%
AM Best, A Rating [Member] | Reinsurer E [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 37,138	$ 43,818
Reinsurance Recoverables, Percentage of Total	5.80%	7.60%