Acquisition of Florida Chemical Company, Inc. - Additional Disclosures (Details) (USD $)	1 Months Ended	12 Months Ended			0 Months Ended	3 Months Ended	12 Months Ended	1 Months Ended
	May 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	May 10, 2013 Florida Chemical Company, Inc [Member]	Sep. 30, 2013 Florida Chemical Company, Inc [Member]	Dec. 31, 2013 Florida Chemical Company, Inc [Member]	May 31, 2013 Revolving Credit Facility [Member]	May 31, 2013 Selling, General and Administrative Expenses [Member] Florida Chemical Company, Inc [Member]
Business Acquisition [Line Items]
Percent of outstanding shares acquired					100.00%
Increase in long-term debt	$ 25,000,000	$ 26,190,000	$ 25,000,000	$ 0
Additional borrowing on credit facility								28,700,000
Common stock, shares issued (in shares)					3,284,180
Escrow fund to cover indemnification obligations					10,000,000
Revenue of the acquired business from the date of acquisition						50,900,000
Income from operations of the acquired business from the date of acquisition							10,000,000
Acquisition costs incurred									$ 1,400,000