Summary of Significant Accounting Policies (Schedule of Other, Net) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accounting Policies [Abstract]
Interest and dividend income	$ 3,139	$ 2,145	$ 6,347	$ 4,067
Equity in (losses) earnings from investments	(1,685)	4,813	(323)	5,975
Net gains (losses) recognized on investment securities	2,315	3,006	7,088	(333)
Net periodic benefit cost other than the service costs	(575)	(254)	(1,116)	(507)
Other (expense) income	(98)	1	(98)	(23)
Other, net	$ 3,096	$ 9,711	$ 11,898	$ 9,179

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Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities.

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Defined Benefit Plan, Net Periodic Benefit Cost Other than the Service Costs

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Nonoperating Income (Expense), Other

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