Derivatives (Details 1) (USD $)	12 Months Ended		12 Months Ended
	Dec. 31, 2011	Mar. 31, 2011 Year	Dec. 31, 2011 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member]	Dec. 31, 2010 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member]	Dec. 31, 2011 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Interest Rate Contracts [Member]	Dec. 31, 2010 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Interest Rate Contracts [Member]	Dec. 31, 2011 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Foreign Exchange Contracts [Member]	Dec. 31, 2010 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Foreign Exchange Contracts [Member]	Dec. 31, 2011 Other Income [Member] Not Designated as Hedging Instrument [Member] Foreign Exchange Contracts [Member]	Dec. 31, 2010 Other Income [Member] Not Designated as Hedging Instrument [Member] Foreign Exchange Contracts [Member]	Mar. 31, 2011 Interest Rate Swap [Member] Designated as Hedging Instrument [Member] Cash Flow Hedging [Member]	Mar. 31, 2011 Interest Rate Swap [Member] Designated as Hedging Instrument [Member] Cash Flow Hedging [Member]
Derivative [Line Items]
Number of Interest Rate Derivatives Held		2
Maturity of Foreign Currency Derivatives	2 years
Derivative, Amount of Hedged Item											$ 100,000,000
Derivative, Fixed Interest Rate												2.947%
Derivative, Net Hedge Ineffectiveness Gain (Loss)	0
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net			381,000	1,446,000	422,000	1,262,000	(41,000)	184,000
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net									$ (2,238,000)	$ 2,925,000