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Investment Securities - Amortized cost and estimated fair value of investment securities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized cost, current	$ 954,797
Accumulated gross unrealized gain, current	359
Accumulated gross unrealized loss, current	6,479
Debt securities, current	948,677	$ 0
Amortized cost, noncurrent	40,394	37,219
Accumulated gross unrealized gain, noncurrent	4	55
Accumulated gross unrealized loss, noncurrent	748	1
Debt securities, noncurrent	39,650	37,273
Amortized Cost	995,191	37,219
Total Unrealized Gains	363	55
Total Unrealized Losses	7,227	1
Fair Value	988,327	37,273
Trading securities	11,300	9,600
U.S. treasury notes
Debt Securities, Available-for-sale [Line Items]
Amortized cost, current	308,058
Accumulated gross unrealized gain, current	250
Accumulated gross unrealized loss, current	1,113
Debt securities, current	307,195
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost, current	355,102
Accumulated gross unrealized gain, current	30
Accumulated gross unrealized loss, current	3,289
Debt securities, current	351,843
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized cost, current	31,273
Accumulated gross unrealized gain, current	44
Accumulated gross unrealized loss, current	149
Debt securities, current	31,168
Amortized cost, noncurrent	3,107	195
Accumulated gross unrealized gain, noncurrent	1	2
Accumulated gross unrealized loss, noncurrent	0	0
Debt securities, noncurrent	3,108	197
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost, current	120,774
Accumulated gross unrealized gain, current	24
Accumulated gross unrealized loss, current	587
Debt securities, current	120,211
Amortized cost, noncurrent	167	211
Accumulated gross unrealized gain, noncurrent	1	0
Accumulated gross unrealized loss, noncurrent	0	1
Debt securities, noncurrent	168	210
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost, current	139,590
Accumulated gross unrealized gain, current	11
Accumulated gross unrealized loss, current	1,341
Debt securities, current	138,260
Amortized cost, noncurrent	121	133
Accumulated gross unrealized gain, noncurrent	2	5
Accumulated gross unrealized loss, noncurrent	0	0
Debt securities, noncurrent	123	138
Mutual fund
Debt Securities, Available-for-sale [Line Items]
Amortized cost, noncurrent	27,999	27,680
Accumulated gross unrealized gain, noncurrent	0	48
Accumulated gross unrealized loss, noncurrent	748	0
Debt securities, noncurrent	27,251	27,728
Pooled investment fund
Debt Securities, Available-for-sale [Line Items]
Amortized cost, noncurrent	9,000	9,000
Accumulated gross unrealized gain, noncurrent	0	0
Accumulated gross unrealized loss, noncurrent	0	0
Debt securities, noncurrent	$ 9,000	$ 9,000

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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).

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