Basis of Presentation Cost of Goods Sold (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Cost of Goods Sold [Line Items]
Cost of goods sold	$ 569,880	$ 497,211	$ 1,677,596	$ 1,556,379
Out-of-period adjustments
Cost of Goods Sold [Line Items]
Cost of goods sold	$ 7,000