Derivatives (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		1 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member]	Jun. 30, 2012 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member]	Jun. 30, 2013 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member]	Jun. 30, 2012 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member]	Jun. 30, 2013 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Interest Rate Contract [Member]	Jun. 30, 2012 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Interest Rate Contract [Member]	Jun. 30, 2013 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Interest Rate Contract [Member]	Jun. 30, 2012 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Interest Rate Contract [Member]	Jun. 30, 2013 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Foreign Exchange Contract [Member]	Jun. 30, 2012 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Foreign Exchange Contract [Member]	Jun. 30, 2013 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Foreign Exchange Contract [Member]	Jun. 30, 2012 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Foreign Exchange Contract [Member]	Jun. 30, 2013 Not Designated as Hedging Instrument [Member] Foreign Exchange Contract [Member]	Jun. 30, 2012 Not Designated as Hedging Instrument [Member] Foreign Exchange Contract [Member]	Jun. 30, 2013 Not Designated as Hedging Instrument [Member] Foreign Exchange Contract [Member]	Jun. 30, 2012 Not Designated as Hedging Instrument [Member] Foreign Exchange Contract [Member]	Apr. 30, 2012 Interest Rate Swap [Member] Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Bank
Derivative [Line Items]
Term of interest rate derivatives																					5 years
Number of banks transacted with for interest rate swap agreements (in banks)																					3
Derivative amount of hedge																					$ 100,000
Variable rate basis																					one-month LIBOR
Fixed interest rate																					1.03%
Maximum remaining maturity of foreign currency derivatives	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					(81)	(633)	346	(397)	911	(699)	1,067	(699)	(992)	66	(721)	302
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net																	$ 425	$ (82)	$ (3,481)	$ (911)