Other Intangible Asset - Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Other intangible assets
Amortizable intangibles, gross carrying amount	$ 198,075	$ 198,075
Amortizable intangibles, accumulated amortization	111,953	100,997
Finite-Lived Intangible Assets, Net, Total	86,122	97,078
Intangible Assets, Gross (Excluding Goodwill), Total	275,675	275,675
Net Carrying Amount	163,722	174,678
Dealer network
Other intangible assets
Amortizable intangibles, gross carrying amount	80,000	80,000
Amortizable intangibles, accumulated amortization	63,000	59,000
Finite-Lived Intangible Assets, Net, Total	17,000	21,000
Customer relations
Other intangible assets
Amortizable intangibles, gross carrying amount	80,920	80,920
Amortizable intangibles, accumulated amortization	21,914	16,607
Finite-Lived Intangible Assets, Net, Total	59,006	64,313
Patents
Other intangible assets
Amortizable intangibles, gross carrying amount	21,136	21,136
Amortizable intangibles, accumulated amortization	13,229	11,974
Finite-Lived Intangible Assets, Net, Total	7,907	9,162
Noncompete agreements
Other intangible assets
Amortizable intangibles, gross carrying amount	8,640	8,640
Amortizable intangibles, accumulated amortization	8,177	7,877
Finite-Lived Intangible Assets, Net, Total	463	763
Trademark
Other intangible assets
Amortizable intangibles, gross carrying amount	5,459	5,459
Amortizable intangibles, accumulated amortization	3,713	3,619
Finite-Lived Intangible Assets, Net, Total	1,746	1,840
Backlog
Other intangible assets
Amortizable intangibles, gross carrying amount	1,900	1,900
Amortizable intangibles, accumulated amortization	1,900	1,900
License
Other intangible assets
Amortizable intangibles, gross carrying amount	20	20
Amortizable intangibles, accumulated amortization	20	20
Trademark and tradenames
Other intangible assets
Indefinite-lived intangibles, net carrying amount	$ 77,600	$ 77,600