Summary of Significant Accounting Policies (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounting Policies [Abstract]
Prior period reclassification of ad valorem tax expenses		$ 1,500,000	$ 1,500,000
Allowances for Doubtful Accounts [Table]
At beginning of period	1,085,000	1,849,000	2,590,000
Activity in the period:
Provision for doubtful accounts	374,000	(237,000)	973,000
Account chargeoffs	(110,000)	(527,000)	(1,714,000)
At end of period	1,349,000	1,085,000	1,849,000
Inventories Detail [Table]
Finished goods	73,515,000	72,312,000
Raw materials	3,894,000	5,396,000
Parts and supplies	22,668,000	24,497,000
Work in progress	715,000	836,000
Inventories	100,792,000	103,041,000
Depreciation and depletion expense	76,900,000	70,700,000	87,700,000
Interest capitalized	1,600,000	2,000,000	1,200,000
Amortization expense of patents, trademarks, and other intangible assets	5,000,000	4,500,000	2,800,000
Future amortization expense, 2014	3,700,000
Future amortization expense, 2015	3,400,000
Future amortization expense, 2016	3,200,000
Future amortization expense, 2017	3,000,000
Future amortization expense, 2018	2,900,000
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value of acquired intangible assets		$ 27,300,000	$ 1,400,000
Minimum [Member] | Finite-Lived Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Average useful life of finite-lived intangible asset	3 years	3 years	3 years
Maximum [Member] | Finite-Lived Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Average useful life of finite-lived intangible asset	20 years	20 years	6 years
Weighted Average [Member] | Finite-Lived Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Average useful life of finite-lived intangible asset		12 years 36 days	5 years 219 days
Building [Member] | Minimum [Member]
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment, useful life	15 years
Building [Member] | Maximum [Member]
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment, useful life	40 years
Barges and vessels [Member] | Minimum [Member]
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment, useful life	5 years
Barges and vessels [Member] | Maximum [Member]
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment, useful life	30 years
Machinery and equipment [Member] | Minimum [Member]
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment, useful life	2 years
Machinery and equipment [Member] | Maximum [Member]
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment, useful life	20 years
Automobiles and trucks [Member] | Minimum [Member]
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment, useful life	4 years
Chemical plants [Member] | Minimum [Member]
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment, useful life	15 years
Chemical plants [Member] | Maximum [Member]
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment, useful life	30 years