Fair Value Measurements and Derivative Instruments (Unrealized Holding Losses) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Greater than 12 continuous months, Fair Value	$ 202,844	$ 2,369
Greater than 12 continuous months, Gross unrealized losses	7,294	76
Less than 12 continuous months, Fair Value	56,743	132,267
Less than 12 continuous months, Gross unrealized losses	$ 1,434	1,072
Unrealized loss position, percentage	37.00%
Government and related securities
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Greater than 12 continuous months, Fair Value	$ 16,018	0
Greater than 12 continuous months, Gross unrealized losses	579	0
Less than 12 continuous months, Fair Value	15,438	8,500
Less than 12 continuous months, Gross unrealized losses	433	78
Corporate debt securities
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Greater than 12 continuous months, Fair Value	51,385	0
Greater than 12 continuous months, Gross unrealized losses	2,658	0
Less than 12 continuous months, Fair Value	8,859	39,313
Less than 12 continuous months, Gross unrealized losses	339	355
Mortgage-backed / asset-backed securities
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Greater than 12 continuous months, Fair Value	135,441	2,369
Greater than 12 continuous months, Gross unrealized losses	4,057	76
Less than 12 continuous months, Fair Value	30,754	84,454
Less than 12 continuous months, Gross unrealized losses	629	639
Commingled fixed income securities
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Less than 12 continuous months, Fair Value	1,692	0
Less than 12 continuous months, Gross unrealized losses	$ 33	$ 0

Debt Securities, Available-for-sale, Unrealized Loss Position, Percentage

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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), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455

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-Publisher FASB
-Name Accounting Standards Codification
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+ References

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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), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563

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-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455

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-Name Accounting Standards Codification
-Topic 326
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-Section 55
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-URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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