Significant Accounting Policies - Income Taxes - Intra-Entity Transfers of Assets Other than Inventory (Narrative) (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax expense (benefit)		$ 57,285	$ 48,871	$ 69,038
Deferred tax asset			$ 22,018
Deficit | ASU 2016-16 | New Accounting Pronouncement, Early Adoption, Effect
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax expense (benefit)	$ 124,500
Deferred tax asset	178,600
Prepaid income taxes	$ 54,100