Other Current Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Other Current Accrued Liabilities [Abstract]
Customer prepayments	$ 12,075	$ 15,681
Deferred compensation & benefit plans	7,296	6,918
Acquisition hold back and royalty consideration	719	2,330
Accrued interest	1,851	1,634
Accrued freight	4,795	5,098
Other accrued liabilities	4,571	2,322
Total other current accrued liabilities	$ 31,307	$ 33,983