Contingencies - Additional Information (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Aug. 31, 2017 USD ($)	Jun. 30, 2019 USD ($) lawsuit	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) lawsuit insurance_carrier	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) lawsuit	Dec. 31, 2017 USD ($) lawsuit
Loss Contingencies [Line Items]
Product liability expense		$ 3,529	$ 8,018	$ 6,425	$ 10,842
Loss contingency, years of activity				5 years
Minimum number of insurance carriers | insurance_carrier				20
Insurance receivables		59,900		$ 59,900		$ 71,700	$ 134,700
Insurance receivables, current		9,900		9,900		14,800
Insurance receivables, noncurrent		50,000		50,000		56,900
Notes receivable from insurance companies		60,300		60,300		59,600	$ 76,900
Notes receivable from insurance companies, current		3,616		3,616		3,555
Amount reported in notes receivable, insurance companies, noncurrent		56,700		56,700		56,000
Product warranty expense				5,900	5,500
Single Incident
Loss Contingencies [Line Items]
Product liability accrual		$ 4,000		4,000		$ 3,600
Product liability expense				$ 400	900
Lawsuit
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit		1,552		1,552		1,481	1,420
Damages from Product Defects
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit		2,450		2,450		2,355	2,242
Cumulative Trauma
Loss Contingencies [Line Items]
Product liability accrual		$ 158,800		$ 158,800		$ 187,300
Product liability expense				7,100	11,800
Claims Settled, But Not Yet Paid
Loss Contingencies [Line Items]
Product liability accrual		10,000		10,000		24,500
Uninsured Cumulative Trauma
Loss Contingencies [Line Items]
Product liability expense				6,400	$ 10,800
Other Current Liabilities | Cumulative Trauma
Loss Contingencies [Line Items]
Product liability accrual		12,500		12,500		38,800
Other Noncurrent Liabilities | Cumulative Trauma
Loss Contingencies [Line Items]
Product liability accrual						148,500
Other Noncurrent Liabilities | Cumulative Trauma, Reported Claims
Loss Contingencies [Line Items]
Product liability, gross		$ 146,300		146,300
Settled Litigation
Loss Contingencies [Line Items]
Damages awarded	$ 75,200
Payments to resolve cumulative trauma claims				$ 21,400		$ 28,600