Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Details Textual)

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Summary of Significant Accounting Policies (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Accounting Policies [Abstract]      
Total debt $ 2,956,649   $ 3,013,974
Fair value approximated 3,192,636   3,506,546
Accumulated other comprehensive income, net of tax 15   71
Foreign currency translation adjustment, net of tax (56) 67  
Foreign currency translation adjustment, tax $ 35