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Investments in Debt and Equity Securities (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Investments in Debt and Equity Securities    
Gross unrealized losses greater than one year $ 22,298,000 $ 49,975,000
Percent of gross unrealized losses which have been unrealized for greater than one year 78.00% 59.00%
Gross unrealized losses less than one year $ 35,640,000 $ 148,638,000
Cost    
Equity 256,835,000 251,226,000
Debt 309,021,000 278,030,000
Other 8,198,000 3,075,000
Total 574,054,000 532,331,000
Gains    
Equity 114,881,000 64,954,000
Debt 10,185,000 1,718,000
Total 125,066,000 66,672,000
Losses    
Equity (7,298,000) (9,105,000)
Debt (563,000) (4,955,000)
Total (7,861,000) (14,060,000)
Fair Value    
Equity 364,418,000 307,075,000
Debt 318,643,000 274,793,000
Other 8,198,000 3,075,000
Total $ 691,259,000 $ 584,943,000