Fair Value Measurements (Details) (Fair value, measurements, recurring, USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Assets, fair value disclosure	$ 24,163	$ 15,872
Liabilities, fair value disclosure	(22,199)	(18,613)
Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Assets, fair value disclosure	2,219
Liabilities, fair value disclosure		(2,617)
Non-qualified deferred compensation assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Assets, fair value disclosure	21,944	15,872
Commodity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Liabilities, fair value disclosure	(255)	(124)
Non-qualified deferred compensation liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Liabilities, fair value disclosure	(21,944)	(15,872)
Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Assets, fair value disclosure	21,944	15,872
Liabilities, fair value disclosure	(21,944)	(15,872)
Level 1 | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Assets, fair value disclosure
Liabilities, fair value disclosure
Level 1 | Non-qualified deferred compensation assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Assets, fair value disclosure	21,944	15,872
Level 1 | Commodity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Liabilities, fair value disclosure
Level 1 | Non-qualified deferred compensation liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Liabilities, fair value disclosure	(21,944)	(15,872)
Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Assets, fair value disclosure	2,219
Liabilities, fair value disclosure	(255)	(2,741)
Level 2 | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Assets, fair value disclosure	2,219
Liabilities, fair value disclosure		(2,617)
Level 2 | Non-qualified deferred compensation assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Assets, fair value disclosure
Level 2 | Commodity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Liabilities, fair value disclosure	(255)	(124)
Level 2 | Non-qualified deferred compensation liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Liabilities, fair value disclosure