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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]      
Cash held for escrow and trust deposits $ 20,510 $ 18,674  
Like-kind exchange deposits and reverse exchange property $ 171,010 $ 82,477  
Net Premiums Written Percentage 10.30% 23.60% 16.40%