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Fair Value of Financial Instruments - Schedule of Changes in Level 3 Financial Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Changes in balances of Level 3 financial assets          
Balance at beginning of period $ 259,891 $ 174,133 $ 199,664 $ 206,666 $ 206,666
Total realized/unrealized net earnings (loss) 1,558 115 3,158 (7,284)  
Total realized/unrealized other comp. income (loss) (1,870) (707) (5,793) 5,739  
Purchases and issuances 252,056 20,206 374,410 113,104  
Sales and settlements (20,483) (24,952) (92,630) (69,977)  
Transfer into Level 3 18,842 26,401 43,479 31,511  
Transfer out of Level 3 0 (3,923) (12,294) (88,486)  
Balance at end of period 509,994 191,273 509,994 191,273 199,664
Changes in balances of Level 3 financial liabilities          
Balance at beginning of period 4,223 16,863 4,770 16,285 16,285
Total realized/unrealized net earnings (loss) (289) (7,037) (836) (6,459)  
Total realized/unrealized other comp. income (loss) 0 0 0 0  
Purchases and issuances 2,585 0 2,585 0  
Sales and settlements 0 0 0 0  
Transfer into Level 3 0 0 0 0  
Transfer out of Level 3 0 0 0 0  
Balance at end of period 6,519 9,826 $ 6,519 9,826 4,770
Assets, Total | Level 3          
Changes in balances of Level 3 financial liabilities          
Percent of total assets (less than)     1.00%    
Warrant liability          
Changes in balances of Level 3 financial liabilities          
Balance at beginning of period 3,316 4,091 $ 3,826 4,058 4,058
Total realized/unrealized net earnings (loss) (120) (1,000) (630) (967)  
Total realized/unrealized other comp. income (loss) 0 0 0 0  
Purchases and issuances 822 0 822 0  
Sales and settlements 0 0 0 0  
Transfer into Level 3 0 0 0 0  
Transfer out of Level 3 0 0 0 0  
Balance at end of period 4,018 3,091 4,018 3,091 3,826
Contingent liability          
Changes in balances of Level 3 financial liabilities          
Balance at beginning of period 0 11,730 0 11,411 11,411
Total realized/unrealized net earnings (loss) 0 (6,321) 0 (6,002)  
Total realized/unrealized other comp. income (loss) 0 0 0 0  
Purchases and issuances 1,763 0 1,763 0  
Sales and settlements 0 0 0 0  
Transfer into Level 3 0 0 0 0  
Transfer out of Level 3 0 0 0 0  
Balance at end of period 1,763 5,409 1,763 5,409 0
Other          
Changes in balances of Level 3 financial liabilities          
Balance at beginning of period 907 1,042 944 816 816
Total realized/unrealized net earnings (loss) (169) 284 (206) 510  
Total realized/unrealized other comp. income (loss) 0 0 0 0  
Purchases and issuances 0 0 0 0  
Sales and settlements 0 0 0 0  
Transfer into Level 3 0 0 0 0  
Transfer out of Level 3 0 0 0 0  
Balance at end of period 738 1,326 738 1,326 944
Fixed maturity securities          
Changes in balances of Level 3 financial assets          
Balance at beginning of period 234,763        
Total realized/unrealized net earnings (loss) 114        
Total realized/unrealized other comp. income (loss) (1,870)        
Purchases and issuances 219,949        
Sales and settlements (20,483)        
Transfer into Level 3 13,493        
Transfer out of Level 3 0        
Balance at end of period 445,966   445,966    
U.S. Government and government agencies          
Changes in balances of Level 3 financial assets          
Balance at beginning of period 0        
Total realized/unrealized net earnings (loss) (11)        
Total realized/unrealized other comp. income (loss) (2)        
Purchases and issuances 2,285        
Sales and settlements 0        
Transfer into Level 3 0        
Transfer out of Level 3 0        
Balance at end of period 2,272   2,272    
States, municipalities and political subdivisions          
Changes in balances of Level 3 financial assets          
Balance at beginning of period 409        
Total realized/unrealized net earnings (loss) (1)        
Total realized/unrealized other comp. income (loss) (16)        
Purchases and issuances 0        
Sales and settlements 0        
Transfer into Level 3 0        
Transfer out of Level 3 0        
Balance at end of period 392   392    
Residential mortgage-backed securities          
Changes in balances of Level 3 financial assets          
Balance at beginning of period 12,267        
Total realized/unrealized net earnings (loss) 42        
Total realized/unrealized other comp. income (loss) (373)        
Purchases and issuances 33,726        
Sales and settlements (1,375)        
Transfer into Level 3 2,562        
Transfer out of Level 3 0        
Balance at end of period 46,849   46,849    
Commercial mortgage-backed securities          
Changes in balances of Level 3 financial assets          
Balance at beginning of period 22,051        
Total realized/unrealized net earnings (loss) (39)        
Total realized/unrealized other comp. income (loss) 18        
Purchases and issuances 2,086        
Sales and settlements (63)        
Transfer into Level 3 1,795        
Transfer out of Level 3 0        
Balance at end of period 25,848   25,848    
Asset-backed securities          
Changes in balances of Level 3 financial assets          
Balance at beginning of period 132,744        
Total realized/unrealized net earnings (loss) (39)        
Total realized/unrealized other comp. income (loss) (665)        
Purchases and issuances 116,833        
Sales and settlements (9,265)        
Transfer into Level 3 0        
Transfer out of Level 3 0        
Balance at end of period 239,608   239,608    
Corporate and other          
Changes in balances of Level 3 financial assets          
Balance at beginning of period 67,292        
Total realized/unrealized net earnings (loss) 162        
Total realized/unrealized other comp. income (loss) (832)        
Purchases and issuances 65,019        
Sales and settlements (9,780)        
Transfer into Level 3 9,136        
Transfer out of Level 3 0        
Balance at end of period 130,997   130,997    
Equity securities | Fixed maturity securities          
Changes in balances of Level 3 financial assets          
Balance at beginning of period   169,888 192,810 198,277 198,277
Total realized/unrealized net earnings (loss)   106 1,362 (2,793)  
Total realized/unrealized other comp. income (loss)   (707) (5,793) 5,383  
Purchases and issuances   20,206 327,360 113,104  
Sales and settlements   (24,952) (92,630) (69,977)  
Transfer into Level 3   20,020 35,151 25,130  
Transfer out of Level 3   (3,923) (12,294) (88,486)  
Balance at end of period 445,966 180,638 445,966 180,638 192,810
Equity securities | U.S. Government and government agencies          
Changes in balances of Level 3 financial assets          
Balance at beginning of period     0 32 32
Total realized/unrealized net earnings (loss)     (11) 0  
Total realized/unrealized other comp. income (loss)     (2) 0  
Purchases and issuances     2,285 0  
Sales and settlements     0 (17)  
Transfer into Level 3     0 0  
Transfer out of Level 3     0 (15)  
Balance at end of period 2,272 0 2,272 0 0
Equity securities | States, municipalities and political subdivisions          
Changes in balances of Level 3 financial assets          
Balance at beginning of period   7,511 6,011 5,690 5,690
Total realized/unrealized net earnings (loss)   (3) (1) (2)  
Total realized/unrealized other comp. income (loss)   (100) (148) (144)  
Purchases and issuances   116 121 344  
Sales and settlements   0 0 0  
Transfer into Level 3   0 418 1,636  
Transfer out of Level 3   (1,632) (6,009) (1,632)  
Balance at end of period 392 5,892 392 5,892 6,011
Equity securities | Residential mortgage-backed securities          
Changes in balances of Level 3 financial assets          
Balance at beginning of period   18,486 14,612 55,954 55,954
Total realized/unrealized net earnings (loss)   21 166 (720)  
Total realized/unrealized other comp. income (loss)   22 246 901  
Purchases and issuances   0 33,726 3,465  
Sales and settlements   (921) (6,642) (7,283)  
Transfer into Level 3   1,041 8,092 3,203  
Transfer out of Level 3   (868) (3,351) (37,739)  
Balance at end of period 46,849 17,781 46,849 17,781 14,612
Equity securities | Commercial mortgage-backed securities          
Changes in balances of Level 3 financial assets          
Balance at beginning of period   3,754 12,157 43,018 43,018
Total realized/unrealized net earnings (loss)   (4) (118) 111  
Total realized/unrealized other comp. income (loss)   1 (246) 76  
Purchases and issuances   0 12,362 0  
Sales and settlements   (69) (102) (10,083)  
Transfer into Level 3   8,620 1,795 8,620  
Transfer out of Level 3   0 0 (29,440)  
Balance at end of period 25,848 12,302 25,848 12,302 12,157
Equity securities | Asset-backed securities          
Changes in balances of Level 3 financial assets          
Balance at beginning of period   119,598 133,742 73,217 73,217
Total realized/unrealized net earnings (loss)   97 1,119 1,147  
Total realized/unrealized other comp. income (loss)   572 (3,941) 880  
Purchases and issuances   15,780 184,833 97,051  
Sales and settlements   (23,947) (73,211) (48,461)  
Transfer into Level 3   1,065 0 1,065  
Transfer out of Level 3   0 (2,934) (11,734)  
Balance at end of period 239,608 113,165 239,608 113,165 133,742
Equity securities | Corporate and other          
Changes in balances of Level 3 financial assets          
Balance at beginning of period   20,539 26,288 20,366 20,366
Total realized/unrealized net earnings (loss)   (5) 207 (3,329)  
Total realized/unrealized other comp. income (loss)   (1,202) (1,702) 3,670  
Purchases and issuances   4,310 94,033 12,244  
Sales and settlements   (15) (12,675) (4,133)  
Transfer into Level 3   9,294 24,846 10,606  
Transfer out of Level 3   (1,423) 0 (7,926)  
Balance at end of period 130,997 31,498 130,997 31,498 26,288
Equity securities | Equity securities          
Changes in balances of Level 3 financial assets          
Balance at beginning of period 24,848 2,090 6,594 4,576 4,576
Total realized/unrealized net earnings (loss) 1,434 0 1,766 (2,842)  
Total realized/unrealized other comp. income (loss) 0 0 0 356  
Purchases and issuances 32,107 0 47,050 0  
Sales and settlements 0 0 0 0  
Transfer into Level 3 5,349 6,381 8,328 6,381  
Transfer out of Level 3 0 0 0 0  
Balance at end of period 63,738 8,471 63,738 8,471 6,594
Equity securities | Common Stock          
Changes in balances of Level 3 financial assets          
Balance at beginning of period 483 2,090 157 4,576 4,576
Total realized/unrealized net earnings (loss) 1,784 0 1,661 (2,842)  
Total realized/unrealized other comp. income (loss) 0 0 0 356  
Purchases and issuances 100 0 100 0  
Sales and settlements 0 0 0 0  
Transfer into Level 3 4,339 280 4,788 280  
Transfer out of Level 3 0 0 0 0  
Balance at end of period 6,706 2,370 6,706 2,370 157
Equity securities | Perpetual preferred stocks          
Changes in balances of Level 3 financial assets          
Balance at beginning of period 24,365 0 6,437 0 0
Total realized/unrealized net earnings (loss) (350) 105 0  
Total realized/unrealized other comp. income (loss) 0 0 0 0  
Purchases and issuances 32,007 0 46,950 0  
Sales and settlements 0 0 0 0  
Transfer into Level 3 1,010 6,101 3,540 6,101  
Transfer out of Level 3 0 0 0 0  
Balance at end of period 57,032 6,101 57,032 6,101 6,437
Derivatives          
Changes in balances of Level 3 financial assets          
Balance at beginning of period 280 2,155 260 3,813 3,813
Total realized/unrealized net earnings (loss) 10 9 30 (1,649)  
Total realized/unrealized other comp. income (loss) 0 0 0 0  
Purchases and issuances 0 0 0 0  
Sales and settlements 0 0 0 0  
Transfer into Level 3 0 0 0 0  
Transfer out of Level 3 0 0 0 0  
Balance at end of period $ 290 $ 2,164 $ 290 $ 2,164 $ 260