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Other Comprehensive Income (Reclassifications Out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Compensation and employee benefits	$ 35,700	$ 29,376	$ 96,095	$ 86,735
Income tax expense	9,285	9,938	18,257	26,429
Net income	(27,143)	(31,399)	(56,384)	(86,682)
Reclassification adjustment | Post-retirement obligations
Accumulated Other Comprehensive Income (Loss) [Line Items]
Compensation and employee benefits	112	48	336	142
Income tax expense	(27)	(13)	(97)	(39)
Net income	$ 85	$ 35	$ 239	$ 103

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