Inventories (Schedule of Inventory) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Inventories [Abstract]
Finished goods	$ 67,018	$ 78,715
Work-in-process	13,127	17,693
Raw materials	22,117	19,764
Total inventories at current costs	102,262	116,172
Less: LIFO reserve	(8,765)	(9,064)
Inventory	$ 93,497	$ 107,108