Leased Properties - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Option to extend, amount	$ 21,300
Rent expense	80,487
Operating lease, payments	71,901
Asset obtained in exchange	$ 28,000
Minimum [Member]
Lessee, Lease, Description [Line Items]
Renewal term (or more)	1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Renewal term (or more)		20 years