Accounts Payable, Accrued, and Other Liabilities (Details) - Other Liabilities - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Non-current deferred revenue	$ 16,205	$ 11,289
Long-term taxes payable	66,386	19,737
Benefit plan-related liabilities	118,868	67,747
Lease-related matters	115,840	38,042
Non-current deferred tax liabilities	206,338	22,520
Other	54,362	22,482
Total other liabilities	$ 577,999	$ 181,817