Leases - Other Information Related to Leases (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Operating
Cash paid for amounts included in the measurement of lease liabilities	$ 11,095
Lease assets obtained in exchange for lease obligations	$ 25,244
Weighted average remaining lease term (years)	4 years 8 months 12 days
Weighted average discount rate	4.50%
Finance
Cash paid for amounts included in the measurement of lease liabilities	$ 897
Lease assets obtained in exchange for lease obligations	$ 0
Weighted average remaining lease term (years)	2 years 9 months 18 days
Weighted average discount rate	5.20%