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Debt (Details 1) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Debt [Abstract]    
7.25% unsecured notes due February 1, 2019 $ 397,272 $ 397,065
Commercial paper borrowings 0 109,671
AUD 50M borrowing 51,168 51,012
Other indebtedness 7,302 7,464
Total Debt 455,742 565,212
Less: current portion (3,173) (112,983)
Total Long-Term Debt $ 452,569 $ 452,229