Hedging Activities and Fair Value Measurements (Schedule of Notional Amounts, Fair Values and Classification of the Company's Outstanding Derivatives by Risk Category and Instrument Type) (Details) (USD $) In Thousands	Jun. 30, 2011		Dec. 31, 2010
Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Interest Rate Swaps Contracts [Member]
Notional Amount	$ 79,002	[1]	$ 76,742	[1]
Asset Derivatives Fair Value		[1]		[1]
Liability Derivatives Fair Value	1,172	[1]	1,560	[1]
Not Designated as Hedging Instrument [Member] | Accrued Liabilities [Member] | Foreign Currency Forwards [Member]
Notional Amount			113,871	[1]
Asset Derivatives Fair Value			709	[1]
Liability Derivatives Fair Value			1,884	[1]
Not Designated as Hedging Instrument [Member] | Current Assets [Member] | Foreign Currency Forwards [Member]
Notional Amount	10,389	[1]
Asset Derivatives Fair Value	620	[1]
Not Designated as Hedging Instrument [Member] | Current Liabilities [Member] | Foreign Currency Forwards [Member]
Notional Amount	87,788	[1]
Asset Derivatives Fair Value	499	[1]
Liability Derivatives Fair Value	$ 2,774	[1]

[1] Notional amounts represent the gross contract amounts of the outstanding derivatives excluding the total notional amount of positions that have been effectively closed through offsetting positions. The net gains and net losses associated with positions that have been effectively closed through offsetting positions but not yet settled are included in the asset and liability derivatives fair value columns, respectively.