Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Payables and Accruals [Abstract]
Payroll and benefits	$ 69,629	$ 75,909
Deferred revenue and customer advances	52,822	44,764
Accrued royalties (Note 17)	43,324	43,324
Accrued interest	21,369	21,807
Income taxes payable	17,117	17,528
Accrued severance plan obligations (Note 15)	11,794	11,197
Acquisition payable (Note 3)	0	17,897
Other accrued expenses	35,993	31,826
Total accrued expenses	$ 252,048	$ 264,252