New Accounting Pronouncements (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Tooling receivable	$ 82,150	$ 148,175
Retained earnings	$ 350,270	619,448
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Tooling receivable		(1,573)
Retained earnings		(1,573)
Cumulative Effect, Period of Adoption, Adjusted Balance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Tooling receivable		146,602
Retained earnings		$ 617,875