Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Quarterly Financial Information (Unaudited) - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in Accounting Estimate [Line Items]
Comprehensive income (loss)				$ 16,706	$ (22,537)	$ 27,802
Exclusion of Settlement of Pension Plan
Change in Accounting Estimate [Line Items]
Comprehensive income (loss)	$ 19,000	$ 19,000	$ 19,000