Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Payables and Accruals [Abstract]
Payroll and benefits	$ 80,170	$ 75,909
Deferred revenue and customer advances	54,601	44,764
Accrued interest	43,784	21,807
Accrued royalties (Note 18)	43,324	43,324
Income taxes payable	27,017	17,528
Accrued severance plan obligations (Note 16)	11,189	11,197
Acquisition payable (Note 3)	0	17,897
Other accrued expenses	32,534	31,826
Total accrued expenses	$ 292,619	$ 264,252