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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]      
Cash held for escrow and trust deposits $ 18,032 $ 20,510  
Like-kind exchange deposits and reverse exchange property $ 202,184 $ 171,010  
Net Premiums Written Percentage 5.40% 10.30% 23.60%