Commitments and Contingent Liabilities (Details) $ in Thousands	Sep. 30, 2015 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Irrevocable letters of credit outstanding	$ 10,092
Letters of Credit Outstanding as Collateral for Janesville lease	5,000
Letters of credit outstanding as collateral for commodity hedges	2,000
Letters of credit outstanding for insurance reserve requirements of workers' compensation insurance carriers	$ 1,842