Basis of Presentation and Significant Accounting Policies (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Inventories Detail [Table]
Finished goods	$ 70,574,000		$ 73,515,000
Raw materials	3,974,000		3,894,000
Parts and supplies	22,855,000		22,668,000
Work in progress	922,000		715,000
Inventories	98,325,000		100,792,000
Weighted Average Shares Outstanding [Table]
Number of weighted average common shares outstanding	78,306,000	77,671,000
Assumed exercise of stock options	0	724,000
Average diluted shares outstanding	78,306,000	78,395,000
Outstanding stock options excluded from average diluted shares outstanding		2,434,093
Proceeds from insurance settlements		7,600,000
Fair value of Senior Notes	313,300,000		318,400,000
Carrying value of Senior Notes	305,000,000		305,000,000
Prior period reclassification adjustment		300,000
Fair value of contingent purchase price liability	2,400,000
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset for foreign currency derivative contracts	195,000
Liability for foreign currency derivative contracts	(88,000)
Total	107,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset for foreign currency derivative contracts	0
Liability for foreign currency derivative contracts	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset for foreign currency derivative contracts	195,000
Liability for foreign currency derivative contracts	(88,000)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset for foreign currency derivative contracts	0
Liability for foreign currency derivative contracts	$ 0