Impairment and Other Charges (Details)	12 Months Ended
	Dec. 31, 2019 USD ($)
Impairment and Other Charges.
Abandonment of assets	$ 35,861,000
Assets held for sale write down	14,326,000
Retirement of equipment	17,218,000
Inventory write-downs	9,077,000
Severance costs	5,748,000
Other	43,000
Total	$ 82,273,000