Segment Information (Schedule of Segment Revenues from Major Customers) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue, Major Customer [Line Items]
Revenue from Contract with Customers	$ 1,472,790	$ 1,321,412	$ 1,143,514
PAMC
Revenue, Major Customer [Line Items]
Revenue from Contract with Customers	1,407,864	1,261,346	1,112,050
Sales revenue, goods, net | Customer concentration risk | Customer A | PAMC
Revenue, Major Customer [Line Items]
Revenue from Contract with Customers	283,703
Sales revenue, goods, net | Customer concentration risk | Customer B | PAMC
Revenue, Major Customer [Line Items]
Revenue from Contract with Customers	274,755	145,248
Sales revenue, goods, net | Customer concentration risk | Customer C | PAMC
Revenue, Major Customer [Line Items]
Revenue from Contract with Customers	$ 214,152	$ 222,354	160,818
Sales revenue, goods, net | Customer concentration risk | Customer D | PAMC
Revenue, Major Customer [Line Items]
Revenue from Contract with Customers			$ 116,849