Derivative Financial Instruments (Details) (Level 2 [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Foreign currency derivatives [Member]
Derivative Liability Fair Value Net
Net Asset/ (Liabilities)	$ 5,135
Not a hedge [Member] | Currency Related Swap [Member]
Derivative Liability Fair Value Net
Liability Derivatives, Fair value	(15,630)
Net Asset/ (Liabilities)	(15,630)
Not a hedge [Member] | Foreign currency derivatives [Member]
Derivative Asset Fair Value Net
Assets Derivatives, Fair value, Total	5,672
Derivative Liability Fair Value Net
Liability Derivatives, Fair value, Total	(537)
Net Asset/ (Liabilities)	(531)
Cash flow hedge [Member] | Foreign currency derivatives [Member]
Derivative Liability Fair Value Net
Net Asset/ (Liabilities)	584
Cash flow hedge [Member] | Interest rate swap derivatives [Member]
Derivative Liability Fair Value Net
Net Asset/ (Liabilities)	(260)
Current assets [Member] | Not a hedge [Member] | Foreign currency derivatives [Member]
Derivative Asset Fair Value Net
Assets Derivatives, Fair value	6
Current assets [Member] | Cash flow hedge [Member] | Foreign currency derivatives [Member]
Derivative Asset Fair Value Net
Assets Derivatives, Fair value	584
Current liabilities [Member] | Not a hedge [Member] | Currency Related Swap [Member]
Derivative Liability Fair Value Net
Liability Derivatives, Fair value	(2,558)
Current liabilities [Member] | Not a hedge [Member] | Foreign currency derivatives [Member]
Derivative Liability Fair Value Net
Liability Derivatives, Fair value	(537)
Current liabilities [Member] | Cash flow hedge [Member] | Interest rate swap derivatives [Member]
Derivative Liability Fair Value Net
Liability Derivatives, Fair value, Total	(260)
Non current liabilities [Member] | Not a hedge [Member] | Currency Related Swap [Member]
Derivative Liability Fair Value Net
Liability Derivatives, Fair value	(13,072)
Non Current Assets [Member] | Cash flow hedge [Member] | Foreign currency derivatives [Member]
Derivative Asset Fair Value Net
Assets Derivatives, Fair value	5,082
Derivative Liability Fair Value Net
Net Asset/ (Liabilities)	$ 5,082