Fair Value Information and Derivative Financial Instruments (Details Textual) (USD $)
|
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2012
|
Dec. 31, 2011
|
Dec. 31, 2010
|
|
Fair value information and derivative financial instruments (Textual) [Abstract] | |||
Total derivative ineffectiveness expense | $ 0 | $ 0 | $ 600,000 |
Cost of sales [Member]
|
|||
Derivative Instruments, Gain (Loss) [Line Items] | |||
Recognized gain or loss on undesignated forward contracts | $ 1,200,000 |