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Investments - Aging of Unrealized Losses (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Number of securities, less than 12 months | security 16 147
Fair value, less than 12 months $ 35,523 $ 269,903
Unrealized losses, less than 12 months $ (232) $ (5,099)
Number of securities,12 months or greater | security 54 198
Fair value, 12 months or greater $ 81,827 $ 356,138
Unrealized losses, 12 months or greater $ (778) $ (10,385)
Number of securities, total | security 70 345
Fair value $ 117,350 $ 626,041
Unrealized Losses $ (1,010) $ (15,484)
U.S. Treasury securities and obligations of U.S. government agencies    
Debt Securities, Available-for-sale [Line Items]    
Number of securities, less than 12 months | security 0 0
Fair value, less than 12 months $ 0 $ 0
Unrealized losses, less than 12 months $ 0 $ 0
Number of securities,12 months or greater | security 5 19
Fair value, 12 months or greater $ 13,750 $ 41,817
Unrealized losses, 12 months or greater $ (116) $ (1,376)
Number of securities, total | security 5 19
Fair value $ 13,750 $ 41,817
Unrealized Losses $ (116) $ (1,376)
Municipal debt securities    
Debt Securities, Available-for-sale [Line Items]    
Number of securities, less than 12 months | security 1 4
Fair value, less than 12 months $ 2,000 $ 7,409
Unrealized losses, less than 12 months $ 0 $ (11)
Number of securities,12 months or greater | security 10 31
Fair value, 12 months or greater $ 15,025 $ 58,658
Unrealized losses, 12 months or greater $ (73) $ (952)
Number of securities, total | security 11 35
Fair value $ 17,025 $ 66,067
Unrealized Losses $ (73) $ (963)
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Number of securities, less than 12 months | security 13 118
Fair value, less than 12 months $ 24,737 $ 226,477
Unrealized losses, less than 12 months $ (199) $ (3,952)
Number of securities,12 months or greater | security 33 126
Fair value, 12 months or greater $ 51,099 $ 221,675
Unrealized losses, 12 months or greater $ (586) $ (7,736)
Number of securities, total | security 46 244
Fair value $ 75,836 $ 448,152
Unrealized Losses $ (785) $ (11,688)
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Number of securities, less than 12 months | security 2 25
Fair value, less than 12 months $ 8,786 $ 36,017
Unrealized losses, less than 12 months $ (33) $ (1,136)
Number of securities,12 months or greater | security 6 22
Fair value, 12 months or greater $ 1,953 $ 33,988
Unrealized losses, 12 months or greater $ (3) $ (321)
Number of securities, total | security 8 47
Fair value $ 10,739 $ 70,005
Unrealized Losses $ (36) $ (1,457)