Commitments and Contingent Liabilities (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Irrevocable letters of credit outstanding	$ 6,701
Collateral associated with commodity hedges	4,000
Compliance with the insurance reserve requirements of its workers' compensation insurance carriers	1,901
Product Liability Contingency, Loss Exposure Not Accrued, Low Estimate	325
Product Liability Contingency, Loss Exposure Not Accrued, High Estimate	1,250
Loss Contingency, Estimate of Possible Loss	1,150
Loss Contingency, Loss in Period	1,060
Loss Contingency, Payments and Credits in Period	800
Loss Contingency, Accrual, Current	$ 260