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Stockholder's Equity (Details 3) (USD $)
In Thousands
Jun. 30, 2011
Dec. 31, 2010
Summary of accumulated other comprehensive income/(loss)    
Unrecognized gains (losses) on cash flow hedges $ (9,101) $ (9,969)
Unrecognized gains (losses) on equity investments (411) (497)
Unrecognized actuarial gains (losses) (633) (633)
Totals $ (10,145) $ (11,099) [1]
[1] NOTE: The consolidated balance sheet at December 31, 2010 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements.