Revenue - Foreign Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Consolidated sales									$ 1,474,477	$ 1,577,298	$ 1,240,851
Consolidated assets	$ 2,553,234				$ 2,900,840				2,553,234	2,900,840
Pre-tax income	(385,317)	$ (30,736)	$ 8,445	$ (21,300)	(294,013)	$ 4,769	$ 20,476	$ 38,815	(428,908)	(229,953)	136,526
Net income	(292,871)	$ (23,037)	$ 6,150	$ (19,324)	(256,062)	$ 6,316	$ 17,644	$ 31,294	(329,082)	(200,808)	$ 145,206
Foreign Operations
Disaggregation of Revenue [Line Items]
Consolidated sales									92,800	66,900
Consolidated assets	$ 27,700				$ 7,300				27,700	7,300
Pre-tax income									7,000	5,900
Net income									$ 5,500	$ 4,700