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Non-Operating Income (Tables)
12 Months Ended
Dec. 31, 2011
Nonoperating Income (Expense) [Abstract]  
Schedule of Nonoperating Income, by Component
The following table presents the components of our net non-operating income:

($000)
 
2011

 
2010

 
2009

Interest income
 
$
3,679

 
$
2,718

 
$
3,364

Interest expense
 
(1,318
)
 
(281
)
 
(348
)
Other income (expense), net
 
(652
)
 
4,295

 
(82
)
Non-operating income, net
 
$
1,709

 
$
6,732

 
$
2,934