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Basis of Presentation Revenue Recognition (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Revenue from Contract with Customer [Abstract]      
Customer deposits $ 308,864   $ 250,779
Contract with Customer, Liability, Revenue Recognized 133,900    
contract asset insurance renewals $ 28,800 $ 27,700