Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Payables and Accruals [Abstract]
Payroll and benefits	$ 79,570	$ 56,651
Deferred revenue and customer advances	52,968	52,773
Accrued interest	44,275	19,048
Accrued royalties (Note 17)	43,324	33,324
Acquisition payable (Note 3)	19,459	0
Accrued severance plan obligations (Note 14)	10,411	9,516
Income taxes payable	8,549	8,341
Other accrued expenses	32,287	33,311
Total accrued expenses	$ 290,843	$ 212,964