Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Jun. 22, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Purchase of intellectual property				$ 4,000	$ 0
Amortization of intangible assets		$ 9,800	$ 12,100	20,667	$ 23,893
Intangible assets, amortization expense
Remaining of 2018		17,600		17,600
2019		34,800		34,800
2020		34,300		34,300
2021		33,000		33,000
2022		$ 31,400		$ 31,400
Phantom Controls (Phantom)
Finite-Lived Intangible Assets [Line Items]
Purchase of intellectual property	$ 4,000