CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
REVENUES
Premiums earned, affiliated	$ 154,451	$ 149,988	$ 446,522	$ 436,804
Other income, affiliated	(30)	39	(350)	307
LOSSES AND EXPENSES
Losses and settlement expenses, affiliated	116,908	106,795	318,902	295,061
Amortization of deferred policy acquisition costs, affiliated	26,177	26,256	79,957	79,584
Other underwriting expenses, affiliated	19,520	17,600	57,803	52,120
Other expense, affiliated	$ 442	$ 481	$ 1,423	$ 1,414