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Inventories (Components Of Inventories) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Inventories [Abstract]        
Raw materials $ 43,960 $ 43,960 $ 46,850  
Work in process 4,067 4,067 2,304  
Finished goods and parts 57,850 57,850 47,491  
Inventories, net 105,877 105,877 96,645  
Inventory Write-down $ 18,619 $ 21,550 $ 2,334 $ 4,341