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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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Commitments and Contingencies - Additional Information (Details) (USD $)	4 Months Ended	6 Months Ended
	Jul. 21, 2011 lawsuit	Jun. 30, 2013 T lawsuit	Dec. 31, 2012
Commitments and Contingencies Disclosure [Line Items]
Number of lawsuits filed	2
Number of lawsuits pending		3
Threshold of ownership percentage in Company for private investigation of compliance		5.00%
Environmental liabilities		$ 1,541,000	$ 1,621,000
Supply commitment (in tons)		3,900,000
Surety bonds \| Certain development projects
Commitments and Contingencies Disclosure [Line Items]
Commitment obligations		9,600,000	10,300,000
Surety bonds \| Standby letters of credit
Commitments and Contingencies Disclosure [Line Items]
Commitment obligations		$ 800,000	$ 1,100,000