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Reinsurance (Ceded Premiums and Losses Related to Flood Operations) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Ceded premiums written $ (104,651) $ (99,082) $ (200,596) $ (189,889)
Ceded premiums earned (98,499) (92,621) (196,528) (184,274)
Ceded loss and loss expenses incurred (27,050) (55,757) (71,029) (84,844)
National Flood Insurance Program [Member]        
Ceded premiums written (66,341) (63,808) (123,010) (120,142)
Ceded premiums earned (60,143) (57,655) (119,134) (114,932)
Ceded loss and loss expenses incurred $ (10,261) $ (15,140) $ (25,980) $ (21,681)
Percentage of NFIP claims ceded by federal government     100.00%