Financial Instruments (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Financial assets and liabilities measured at fair value
Mutual fund assets	$ 13,445	$ 12,464
Derivative assets:
Foreign currency contracts	30	100
Total assets at fair value	13,475	12,564
Derivative liabilities:
Foreign currency contracts	3	52
Interest rate contracts		36
Total liabilities at fair value	58	88
Level 1 [Member]
Financial assets and liabilities measured at fair value
Mutual fund assets	13,445	12,464
Derivative assets:
Total assets at fair value	13,445	12,464
Level 2 [Member]
Derivative assets:
Foreign currency contracts	30	100
Total assets at fair value	30	100
Derivative liabilities:
Foreign currency contracts	3	52
Interest rate contracts	55	36
Total liabilities at fair value	58	88
Level 3 [Member]
Financial assets and liabilities measured at fair value
Mutual fund assets
Derivative assets:
Total assets at fair value
Derivative liabilities:
Foreign currency contracts
Total liabilities at fair value