Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Payables and Accruals [Abstract]
Payroll and benefits	$ 112,197	$ 115,693
Short-term operating lease liabilities	43,251	40,972
Income taxes payable	31,439	11,661
Deferred revenue and customer advances	14,968	16,177
Accrued interest	11,486	11,638
Accrued severance plan obligations	11,104	13,408
Short-term finance lease liabilities	9,084	9,121
Other accrued expenses	57,749	48,556
Total accrued expenses	$ 291,278	$ 267,226