Investments (Investment Gains and Losses) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 1,278,293	$ 1,223,747
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	93,255	18,604
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1,900	11,312
Debt Securities, Available-for-sale	1,369,648	1,231,039
US Treasury Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	9,729	9,864
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,775	1,410
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale	11,504	11,274
US Government Agencies Debt Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,522	3,540
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,124	740
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale	4,646	4,280
US States and Political Subdivisions Debt Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	567,551	713,991
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	29,392	7,614
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	125	1,490
Debt Securities, Available-for-sale	596,818	720,115
Corporate Debt Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	560,701	384,817
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	45,148	6,725
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1,741	9,746
Debt Securities, Available-for-sale	604,108	381,796
Commercial Mortgage Backed Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,107	39,694
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	386
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	66
Debt Securities, Available-for-sale	1,107	40,014
Residential Mortgage Backed Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	118,101	66,960
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	15,787	1,726
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	23	2
Debt Securities, Available-for-sale	133,865	68,684
Asset-backed Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	17,480	4,764
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	11	1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	11	8
Debt Securities, Available-for-sale	17,480	4,757
Foreign Government, Non-US [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	102	117
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	18	2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale	$ 120	$ 119

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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