Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets attributable to:
Accrued compensation	$ 8,725	$ 8,146
Accrued expenses, principally for state income taxes, interest and warranty	455	2,807
Net operating loss and other carryforwards	5,937	766
Inventories	1,380	0
Accounts receivable, principally due to allowance for doubtful accounts	1,699	973
Long-term liabilities, principally warranty and exit cost	6,178	505
Other assets	1,202	64
Deferred tax assets	25,576	13,261
Valuation allowance	(6,027)	(722)
Deferred tax assets, net of valuation allowance	19,549	12,539
Deferred tax liabilities attributable to:
Inventories	0	(2,061)
Intangible assets, including goodwill	(66,736)	(83,436)
Property, plant and equipment	(36,873)	(25,520)
Deferred tax liabilities	(103,609)	(111,017)
Net deferred tax liabilities	(84,060)	(98,478)
Other non-current assets	0	1,294
Deferred income taxes	$ (84,060)	$ (99,772)