Derivatives (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		1 Months Ended	3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member]	Sep. 30, 2011 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member]	Sep. 30, 2012 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member]	Sep. 30, 2011 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member]	Sep. 30, 2012 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Interest Rate Contracts [Member]	Sep. 30, 2011 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Interest Rate Contracts [Member]	Sep. 30, 2012 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Interest Rate Contracts [Member]	Sep. 30, 2011 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Interest Rate Contracts [Member]	Sep. 30, 2012 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Foreign Exchange Contracts [Member]	Sep. 30, 2011 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Foreign Exchange Contracts [Member]	Sep. 30, 2012 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Foreign Exchange Contracts [Member]	Sep. 30, 2011 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Foreign Exchange Contracts [Member]	Sep. 30, 2012 Not Designated as Hedging Instrument [Member] Foreign Exchange Contracts [Member]	Sep. 30, 2011 Not Designated as Hedging Instrument [Member] Foreign Exchange Contracts [Member]	Sep. 30, 2012 Not Designated as Hedging Instrument [Member] Foreign Exchange Contracts [Member]	Sep. 30, 2011 Not Designated as Hedging Instrument [Member] Foreign Exchange Contracts [Member]	Apr. 30, 2012 Interest Rate Swap [Member] Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Bank	Mar. 31, 2011 Interest Rate Swap [Member] Designated as Hedging Instrument [Member] Cash Flow Hedging [Member]	Apr. 30, 2012 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] Derivatives
Derivative [Line Items]
Number of Interest Rate Derivatives Held																								2
Term of Interest Rate Derivatives																					5 years	3 years
Number of Banks Transacted With for Interest Rate Swap Agreements																					3
Derivative, Amount of Hedged Item																					$ 100,000	$ 100,000
Debt Instrument, Description of Variable Rate Basis																					one-month LIBOR	one-month LIBOR
Derivative, Fixed Interest Rate																							1.03%	2.947%
Maximum Remaining Maturity of Foreign Currency Derivatives	2 years		2 years
Derivative, Net Hedge Ineffectiveness Gain (Loss)	0	0	0	0
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net					95	(19)	(302)	31	(551)	0	(1,250)	422	646	(19)	948	(391)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net																	$ 2,380	$ (3,144)	$ 3,305	$ (4,055)