Investments (Investment Gains and Losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 1,259,353	$ 1,223,747
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	39,143	18,604
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	2,982	11,312
Debt Securities, Available-for-sale	1,295,514	1,231,039
US Treasury Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	9,841	9,864
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,492	1,410
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale	11,333	11,274
US Government Agencies Debt Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,534	3,540
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	846	740
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale	4,380	4,280
US States and Political Subdivisions Debt Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	686,141	713,991
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	12,434	7,614
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	460	1,490
Debt Securities, Available-for-sale	698,115	720,115
Corporate Debt Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	438,608	384,817
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	18,344	6,725
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	2,518	9,746
Debt Securities, Available-for-sale	454,434	381,796
Commercial Mortgage Backed Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	887	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	887	40,014
Residential Mortgage Backed Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	115,463	66,960
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	6,021	1,726
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	3	2
Debt Securities, Available-for-sale	121,481	68,684
Asset-backed Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	4,763	4,764
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	3	1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1	8
Debt Securities, Available-for-sale	4,765	4,757
Debt Security, Government, Non-US [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	116	117
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	3	2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale	$ 119	$ 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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-Publisher FASB
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-Topic 320
-SubTopic 10
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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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-Publisher FASB
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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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