Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Payables and Accruals [Abstract]
Payroll and benefits	$ 62,298	$ 75,909
Deferred revenue and customer advances	51,323	44,764
Accrued interest	44,351	21,807
Accrued royalties (Note 16)	43,324	43,324
Income taxes payable	14,655	17,528
Accrued severance plan obligations (Note 14)	11,414	11,197
Acquisition payable (Note 3)	0	17,897
Other accrued expenses	31,193	31,826
Total accrued expenses	$ 258,558	$ 264,252