Fair Value of Financial Instruments - Fair Value Relating to Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Secured Debt | Term Loan Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	$ 447,600
Bank of America, N.A.
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amount outstanding under letters of credit			$ 1,205
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amount outstanding under letters of credit	1,014	$ 1,187
Carrying Value | Secured Debt | Term Loan Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	447,600	0
Carrying Value | Secured Debt | Equipment Note
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	20,902	9,629
Carrying Value | ABL Facility | Bank of America, N.A.
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Credit facilities	62,596	40,300
Carrying Value | Japan ABL Facilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Credit facilities	48,115	0
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amount outstanding under letters of credit	1,014	1,187
Fair Value | Secured Debt | Term Loan Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	447,600	0
Fair Value | Secured Debt | Equipment Note
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	20,902	9,629
Fair Value | ABL Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Credit facilities	62,596	40,300
Fair Value | Japan ABL Facilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Credit facilities	$ 48,115	$ 0