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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified											6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Quoted Prices in Active Markets for Identical Assets (Level 1)	Dec. 31, 2012 Quoted Prices in Active Markets for Identical Assets (Level 1)	Jun. 30, 2013 Significant Other Observable Inputs (Level 2)	Dec. 31, 2012 Significant Other Observable Inputs (Level 2)	Jun. 30, 2013 Significant Unobservable Inputs (Level 3)	Dec. 31, 2012 Significant Unobservable Inputs (Level 3)	Jun. 30, 2013 Estimate of Fair Value, Fair Value Disclosure [Member]	Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member]	Jun. 30, 2013 Minimum [Member]	Jun. 30, 2013 Maximum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Asset derivatives	$ 20	$ 3,315	$ 0	$ 0	$ 20	$ 3,315	$ 0	$ 0	$ 20	$ 3,315
Liability derivatives	(1,163)	(1,970)	0	0	(1,163)	(1,970)	0	0	(1,163)	(1,970)
Bank acceptances			0	0	3,348	3,441	0	0	3,348	3,441
Rabbi trust assets			1,845	1,831	0	0	0	0	1,845	1,831
Financial assets and financial liabilities, reported at fair value			$ 1,845	$ 1,831	$ 2,205	$ 4,786	$ 0	$ 0	$ 4,050	$ 6,617
Maturity of bank acceptances											3 months	6 months

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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