Reserves for Unpaid Losses and Loss Adjustment Expenses (Activity in the Reserves for Unpaid Losses and Loss Adjustment Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reserves for Unpaid Losses and Loss Adjustment Expenses [Abstract]
Balance at January 1	$ 450,878	$ 415,135	$ 382,640
Less reinsurance recoverable	102,791	91,943	70,172
Net Balance at January 1	348,087	323,192	312,468
Incurred related to:
Claims and Claim Adjustment Expenses Incurred Related to Current Year	246,080	237,102	215,258
Claims and Claim Adjustment Expenses Incurred Related to Prior Years	7,608	(6,953)	(5,203)
Total incurred	253,688	230,149	210,055
Paid related to:
Current year	93,067	83,132	76,231
Prior years	150,378	122,122	123,100
Total paid	243,445	205,254	199,331
Net Balance at December 31	358,330	348,087	323,192
Plus reinsurance recoverable	123,237	102,791	91,943
Balance at December 31	$ 481,567	$ 450,878	$ 415,135