Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accrued Liabilities [Abstract]
Salaries and wages	$ 18,177	$ 18,562
Accrual for compensated absences	12,886	12,985
Employee benefits	9,960	9,627
Pension liability - current portion	2,321	2,318
Postretirement medical benefits - current portion	5,056	5,547
Returns and allowances	22,428	19,536
Interest	2,131	3,062
Restructuring costs	9,656	4,947
Dividends	4,765
Workers' compensation	2,582	2,924
Billings in excess of revenue recognized	7,081	4,920
Professional fees	2,486	3,173
Utilities	1,175	1,073
Other	11,627	14,583
Total	$ 112,331	$ 103,257