Basis of Presentation and Significant Accounting Policies (Details) (USD $) Share data in Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Inventories Detail [Table]
Finished goods	$ 62,348,000			$ 62,348,000		$ 73,515,000
Raw materials	4,933,000			4,933,000		3,894,000
Parts and supplies	24,333,000			24,333,000		22,668,000
Work in progress	1,072,000			1,072,000		715,000
Inventories	92,686,000			92,686,000		100,792,000
Weighted Average Shares Outstanding [Table]
Number of weighted average common shares outstanding	78,525	77,896		78,416	77,784
Assumed exercise of stock options	0	0		0	0
Average diluted shares outstanding	78,525	77,896		78,416	77,784
Proceeds from insurance settlements			7,600,000
Fair value of Senior Notes	313,100,000			313,100,000		318,400,000
Carrying value of Senior Notes	305,000,000			305,000,000		305,000,000
Prior period reclassification adjustment	300,000			700,000
Fair value of contingent purchase price liability	1,200,000			1,200,000
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset for foreign currency derivative contracts	129,000			129,000
Liability for foreign currency derivative contracts	(176,000)			(176,000)
Acquisition contingent consideration liability	(1,192,000)			(1,192,000)
Total	(1,239,000)			(1,239,000)
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			0
Liability for foreign currency derivative contracts	0			0
Acquisition contingent consideration liability	0			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	129,000			129,000
Liability for foreign currency derivative contracts	(176,000)			(176,000)
Acquisition contingent consideration liability	0			0
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			0
Liability for foreign currency derivative contracts	0			0
Acquisition contingent consideration liability	$ (1,192,000)			$ (1,192,000)