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State and Local Incentives (Changes in Deferred Income from State Incentives) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
State and Local Incentives [Abstract]      
Balance at the beginning of the period $ 13,599 $ 14,318  
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) (2,129) (1,415)
Balance at the end of the year, including current portion $ 11,380 $ 13,599 $ 14,318