Leases - Schedule of Occupancy Expense and Supplemental Cash Flow Information Related to Operating Leases (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Lease, Cost [Abstract]
Fixed costs	$ 8,534	$ 16,836
Variable costs	46	70
Short-term lease costs	203	723
Sublease income	(1,054)	(2,180)
Net lease expense	$ 7,729	15,449
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases		16,408
ROU assets obtained in exchange for lease obligations:
Operating leases		$ 149,621