Reinsurance (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jun. 30, 2017
Reinsurance Disclosures [Abstract]
Reinsurance Retention Policy, Amount Retained	$ 5,000
Reinsurance Retention Policy, Excess Retention, Amount Reinsured	74,600
Retained risk amount	5,000
Catastrophic retention amount increased	$ 10,000
Ceded reinsurance commission percentage	100.00%	100.00%