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Summary of Significant Accounting Policies (Details 1) (USD $) | 12 Months Ended
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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 |  |

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