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Investments (Investments Held in a Loss Position) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Fair value    
Fair Value $ 821,628 $ 317,779
Less than 12 Months, Fair Value 792,087 221,960
More than 12 Months, Fair Value 29,541 95,819
Unrealized Loss    
Unrealized Loss 50,920 3,084
Less than 12 Months, Unrealized Loss 48,240 2,123
More than 12 Months, Unrealized Loss 2,680 961
U.S. Treasury obligations    
Fair value    
Fair Value   25,959
Less than 12 Months, Fair Value   15,305
More than 12 Months, Fair Value   10,654
Unrealized Loss    
Unrealized Loss   126
Less than 12 Months, Unrealized Loss   103
More than 12 Months, Unrealized Loss   23
State and municipal bonds    
Fair value    
Fair Value 26,636 36,565
Less than 12 Months, Fair Value 26,636 35,621
More than 12 Months, Fair Value 0 944
Unrealized Loss    
Unrealized Loss 579 675
Less than 12 Months, Unrealized Loss 579 674
More than 12 Months, Unrealized Loss 0 1
Corporate debt    
Fair value    
Fair Value 532,748 128,254
Less than 12 Months, Fair Value 510,054 88,582
More than 12 Months, Fair Value 22,694 39,672
Unrealized Loss    
Unrealized Loss 33,255 1,575
Less than 12 Months, Unrealized Loss 30,631 932
More than 12 Months, Unrealized Loss 2,624 643
Residential mortgage-backed securities    
Fair value    
Fair Value 66,200 59,291
Less than 12 Months, Fair Value 62,274 28,048
More than 12 Months, Fair Value 3,926 31,243
Unrealized Loss    
Unrealized Loss 5,160 319
Less than 12 Months, Unrealized Loss 5,143 63
More than 12 Months, Unrealized Loss 17 256
Agency commercial mortgage-backed securities    
Fair value    
Fair Value 311 459
Less than 12 Months, Fair Value 0 158
More than 12 Months, Fair Value 311 301
Unrealized Loss    
Unrealized Loss 2 15
Less than 12 Months, Unrealized Loss 0 0
More than 12 Months, Unrealized Loss 2 15
Other commercial mortgage-backed securities    
Fair value    
Fair Value 36,679 18,339
Less than 12 Months, Fair Value 36,059 16,924
More than 12 Months, Fair Value 620 1,415
Unrealized Loss    
Unrealized Loss 2,792 221
Less than 12 Months, Unrealized Loss 2,771 206
More than 12 Months, Unrealized Loss 21 15
Other asset-backed securities    
Fair value    
Fair Value 159,054 48,912
Less than 12 Months, Fair Value 157,064 37,322
More than 12 Months, Fair Value 1,990 11,590
Unrealized Loss    
Unrealized Loss 9,132 153
Less than 12 Months, Unrealized Loss 9,116 145
More than 12 Months, Unrealized Loss $ 16 $ 8