Leases - Narrative (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Leases [Abstract]
Operating lease, expense	$ 17,300	$ 33,800
Operating lease, right-of-use asset	172,400	172,400
Operating lease liability	180,437	180,437
Operating lease, liability, current	34,200	34,200
Operating lease, liability, noncurrent	$ 146,200	$ 146,200
Operating lease, weighted average discount rate, percent	5.70%	5.70%
Finance lease, right-of-use asset	$ 22,600	$ 22,600
Finance lease, liability	22,200	22,200
Finance lease, liability, current	1,200	1,200
Finance lease, liability, noncurrent	$ 21,000	$ 21,000
Operating lease, weighted average remaining lease term	7 years	7 years