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Transactions With Affiliated Parties	12 Months Ended
Transactions With Affiliated Parties	Dec. 31, 2017
Related Party Transactions [Abstract]
Transactions With Affiliated Parties	Transactions With Affiliated Parties We paid certain officers and directors, or insurance agencies of which they are shareholders, commissions of $7 million in 2017, 2016 and 2015, on premium volume of $45 million, $44 million and $42 million for 2017, 2016 and 2015, respectively.