Investment Securities (Components of Investment Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Debt securities available for sale	$ 91,204	$ 83,445
Long-term investments, fair value	34,218	45,781
Equity securities at fair value	78,599	91,977
Long-term investment securities at fair value	34,218	45,781
Fair Value	169,803	175,422
Current investment securities at fair value	135,585	129,641
Equity-method investments	18,310	15,942
Long-term investments	52,528	61,723
Quoted Prices in Active Markets for Identical Assets (Level 1)
Debt Securities, Available-for-sale [Line Items]
Long-term investment securities at fair value	0	0
Current investment securities at fair value	44,381	46,196
Long-term investments	2,077
Significant Other Observable Inputs (Level 2)
Debt Securities, Available-for-sale [Line Items]
Long-term investment securities at fair value	0	0
Current investment securities at fair value	91,204	83,445
Significant Unobservable Inputs (Level 3)
Debt Securities, Available-for-sale [Line Items]
Long-term investment securities at fair value	0	0
Current investment securities at fair value	0	0
Marketable equity securities
Debt Securities, Available-for-sale [Line Items]
Equity securities at fair value	21,155	23,819
Marketable equity securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Debt Securities, Available-for-sale [Line Items]
Equity securities at fair value	21,155	23,819
Marketable equity securities \| Significant Other Observable Inputs (Level 2)
Debt Securities, Available-for-sale [Line Items]
Equity securities at fair value	0	0
Marketable equity securities \| Significant Unobservable Inputs (Level 3)
Debt Securities, Available-for-sale [Line Items]
Equity securities at fair value	0	0
Marketable equity securities \| Fair Value, Measurements, Recurring
Debt Securities, Available-for-sale [Line Items]
Equity securities at fair value		23,819
Mutual funds invested in fixed income securities
Debt Securities, Available-for-sale [Line Items]
Equity securities at fair value	23,226	22,377
Mutual funds invested in fixed income securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Debt Securities, Available-for-sale [Line Items]
Equity securities at fair value	23,226	22,377
Mutual funds invested in fixed income securities \| Significant Other Observable Inputs (Level 2)
Debt Securities, Available-for-sale [Line Items]
Equity securities at fair value	0	0
Mutual funds invested in fixed income securities \| Significant Unobservable Inputs (Level 3)
Debt Securities, Available-for-sale [Line Items]
Equity securities at fair value	0	0
Mutual funds invested in fixed income securities \| Fair Value, Measurements, Recurring
Debt Securities, Available-for-sale [Line Items]
Equity securities at fair value		22,377
Fixed income securities
Debt Securities, Available-for-sale [Line Items]
Debt securities available for sale	91,204
Fixed income securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Debt Securities, Available-for-sale [Line Items]
Debt securities available for sale	0
Fixed income securities \| Significant Other Observable Inputs (Level 2)
Debt Securities, Available-for-sale [Line Items]
Debt securities available for sale	91,204
Fixed income securities \| Significant Unobservable Inputs (Level 3)
Debt Securities, Available-for-sale [Line Items]
Debt securities available for sale	$ 0
Fixed income securities \| Fair Value, Measurements, Recurring
Debt Securities, Available-for-sale [Line Items]
Debt securities available for sale		83,445
Fixed income securities \| Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Debt Securities, Available-for-sale [Line Items]
Debt securities available for sale		0
Fixed income securities \| Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2)
Debt Securities, Available-for-sale [Line Items]
Debt securities available for sale		83,445
Fixed income securities \| Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3)
Debt Securities, Available-for-sale [Line Items]
Debt securities available for sale		$ 0

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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