Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jun. 22, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Purchase of intellectual property				$ 4,000	$ 0
Amortization of intangible assets		$ 8,800	$ 11,500	29,505	$ 35,381
Intangible assets, amortization expense
Remaining of 2018		9,000		9,000
2019		36,400		36,400
2020		35,200		35,200
2021		34,300		34,300
2022		$ 32,600		$ 32,600
Phantom Controls (Phantom)
Finite-Lived Intangible Assets [Line Items]
Purchase of intellectual property	$ 4,000