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 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Accounting Policies [Abstract]          
Total debt $ 2,878,800   $ 2,878,800   $ 3,013,974
Fair value approximated 3,343,100   3,343,100   3,506,546
Accumulated other comprehensive income, net of tax 33   33   71
Foreign currency translation adjustment, net of tax 18 10 (38) 77  
Foreign currency translation adjustment, tax $ 2   $ 32