Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Payables and Accruals [Abstract]
Payroll and benefits	$ 124,735	$ 115,693
Short-term operating lease liabilities	47,265	40,972
Income taxes payable	20,267	11,661
Deferred revenue and customer advances	26,958	16,177
Accrued interest	2,200	11,638
Accrued severance plan obligations	11,701	13,408
Short-term finance lease liabilities	10,228	9,121
Other accrued expenses	55,354	48,556
Total accrued expenses	$ 298,708	$ 267,226