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State and Local Incentives (Changes in Deferred Income from State Incentives) (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2015
State and Local Incentives [Abstract]
Balance at the beginning of the year		$ 9,160	$ 11,380
State and local incentives received during the year	$ 1,410			$ 15,733
Recognition of state and local incentives as a reduction of cost of sales		(2,219)	(2,220)
Balance at the end of the year, including current portion		$ 6,941	$ 9,160