Accrued Expenses (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Payables and Accruals [Abstract]
Payroll and benefits	$ 70,198	$ 69,903
Customer advances and deferred revenue	40,977	34,164
Accrued interest	28,933	12,332
Accrued severance plan obligations (Note 13)	6,886	6,131
Income taxes payable	5,591	10,422
Other accrued expenses	52,222	45,842
Total accrued expenses	$ 204,807	$ 178,794