|
Consolidated Statements of Operations (Parenthetical) (USD $)
|
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2011
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Dec. 31, 2010
|
Dec. 31, 2009
|
|
| Interest Income, Nonoperating | $ 2.2 | $ 3.5 | $ 6.3 |