Derivative Instruments and Hedges (Fair Value Balance Sheet Disclosures) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Nondesignated [Member] | Forward Exchange Contracts [Member]
The fair value of forward exchange contracts not designated as hedging instruments and interest rate swaps in cash flow hedging relationships
Current derivative assets	$ 1,682	$ 2,330
Noncurrent derivative assets	94	10
Current derivative liabilities	7,547	11,196
Noncurrent derivative liabilities	149	516
Cash Flow Hedging [Member] | Interest Rate Swap [Member]
The fair value of forward exchange contracts not designated as hedging instruments and interest rate swaps in cash flow hedging relationships
Current derivative assets	0	33
Noncurrent derivative assets	82	71
Current derivative liabilities	1,298	761
Noncurrent derivative liabilities	$ 614	$ 547