Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified											12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Quoted Prices in Active Markets for Identical Assets (Level 1)	Dec. 31, 2011 Quoted Prices in Active Markets for Identical Assets (Level 1)	Dec. 31, 2012 Significant Other Observable Inputs (Level 2)	Dec. 31, 2011 Significant Other Observable Inputs (Level 2)	Dec. 31, 2012 Significant Unobservable Inputs (Level 3)	Dec. 31, 2011 Significant Unobservable Inputs (Level 3)	Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member]	Dec. 31, 2011 Estimate of Fair Value, Fair Value Disclosure [Member]	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2012 Maximum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Maturity of Bank Acceptances											3 months	6 months
Derivative Assets			$ 0	$ 0	$ 3,315	$ 304	$ 0	$ 0	$ 3,315	$ 304
Derivative Liabilities	(1,970)	(976)	0	0	(1,970)	(976)	0	0	(1,970)	(976)
Bank Acceptances Executed			0		3,441		0		3,441
Rabbi Trust Asset Fair Value Disclosure			1,831	1,494	0	0	0	0	1,831	1,494
Financial Instruments Asset Liabilities at Fair Value Net			$ 1,831	$ 1,494	$ 4,786	$ (672)	$ 0	$ 0	$ 6,617	$ 822