Inventory (Schedule of Inventory) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Inventories [Abstract]
Finished goods	$ 55,166	$ 78,715
Work-in-process	11,332	17,693
Raw materials	19,485	19,764
Total inventories at current costs	85,983	116,172
Less: LIFO reserve	(9,027)	(9,064)
Inventory	76,956	107,108
Excess of Book LIFO Over Tax LIFO	12,241	11,686
Effect Of Inventory Liquidation On Cost Of Good Sold, Increase/(Decrease)	$ 1,128	$ 15	$ (33)