Variable Interest Entities (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Apr. 29, 2011
Equity income (loss) from equity method investments [Abstract]
Total equity income (loss)	$ 0	$ 0	$ 62,050,000
Comparison of carrying amount of assets and liabilities to maximum loss exposure [Abstract]
Equity Method Investments	14,540,000	14,540,000	14,540,000
Subsidiaries Less Than 100% owned by Diversified Lands LLC, Not Primary Beneficiary [Member]
Equity income (loss) from equity method investments [Abstract]
Total equity income (loss)	0	0	(3,000)
Cajun [Member]
Variable Interest Entity [Line Items]
Value of plant acquisition (proceeds)					(298,800,000)
Summarized financial information [Abstract]
Current assets				7,133,000
Property, plant and equipment, net				203,793,000
Total assets				210,926,000
Current liabilities				1,950,000
Other liabilities				9,429,000
Partner's capital				199,547,000
Total liabilities and partners' capital				210,926,000
Operating revenue			5,227,000
Operating expenses			5,914,000
Gain on sale of assets			71,422,000
Other income			929,000
Income before taxes			71,664,000
Equity method investment, income tax expense (benefit)			24,000,000	14,700,000
Equity income (loss) from equity method investments [Abstract]
Total equity income (loss)	0	0	62,053,000
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Variable interest entity, ownership percentage (in hundredths)	50.00%
Ownership percentage by other parties (in hundredths)	50.00%
Summarized financial information [Abstract]
Current assets	2,289,000	1,814,000
Property, plant and equipment, net	22,611,000	23,029,000
Other assets	4,256,000	4,248,000
Total assets	29,156,000	29,091,000
Current liabilities	91,000	26,000
Partner's capital	29,065,000	29,065,000
Total liabilities and partners' capital	29,156,000	29,091,000
Operating revenue	2,558,000	1,126,000	1,781,000
Operating expenses	2,558,000	1,126,000	1,781,000
Income before taxes	0	0	0
Components of equity method investments [Abstract]
Purchase price	12,873,000	12,873,000
Cash contributions	1,659,000	1,659,000
Total equity investment in investee	14,532,000	14,532,000
Comparison of carrying amount of assets and liabilities to maximum loss exposure [Abstract]
Net assets/liabilities	29,065,000	29,065,000
Entity's 50% equity	14,532,000	14,532,000
Equity Method Investments	14,532,000	14,532,000
Maximum [Member] | Subsidiaries Less Than 100% owned by Diversified Lands LLC, Not Primary Beneficiary [Member]
Comparison of carrying amount of assets and liabilities to maximum loss exposure [Abstract]
Equity Method Investments	$ 100,000