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Fair Value Measurements and Derivative Instruments (Available-for-sale Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total | $ 398,054 | $ 218,512
Gross unrealized gains | 1,063 | 4,327
Gross unrealized losses | (4,643) | (719)
Estimated fair value | 394,474 | 222,120
Government and related securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total | 35,018 | 80,732
Gross unrealized gains | 144 | 1,358
Gross unrealized losses | (719) | (114)
Estimated fair value | 34,443 | 81,976
Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total | 84,457 | 70,426
Gross unrealized gains | 422 | 2,009
Gross unrealized losses | (1,920) | (286)
Estimated fair value | 82,959 | 72,149
Commingled fixed income securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total | 1,699 | 1,675
Gross unrealized gains | 21 | 0
Gross unrealized losses | 0 | (19)
Estimated fair value | 1,720 | 1,656
Mortgage-backed / asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total | 276,880 | 65,679
Gross unrealized gains | 476 | 960
Gross unrealized losses | (2,004) | (300)
Estimated fair value | $ 275,352 | $ 66,339

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- Definition 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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