Special Items (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended
	Apr. 03, 2020	Mar. 31, 2020	Mar. 31, 2020	Mar. 31, 2019
Unusual or Infrequent Item, or Both [Line Items]
Collective bargaining agreement payment			$ 20,242	$ 0
Goodwill impairment			106,662	0
Total Special items			126,904	$ 0
Collective bargaining agreement, contract term		5 years
Accrual related to past service		$ 23,500	23,500
Special Item
Unusual or Infrequent Item, or Both [Line Items]
Collective bargaining agreement payment			20,200
Wages and Benefits
Unusual or Infrequent Item, or Both [Line Items]
Collective bargaining agreement payment			$ 3,300
Subsequent Event
Unusual or Infrequent Item, or Both [Line Items]
Collective bargaining agreement, ratification payment term	1 year