Leases - Other Information Related to Leases (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Operating
Cash paid for amounts included in the measurement of lease liabilities	$ 22,167
Lease assets obtained in exchange for lease obligations	$ 33,419
Weighted average remaining lease term (years)	4 years 8 months 12 days
Weighted average discount rate	4.60%
Finance
Cash paid for amounts included in the measurement of lease liabilities	$ 1,734
Lease assets obtained in exchange for lease obligations	$ 0
Weighted average remaining lease term (years)	2 years 8 months 12 days
Weighted average discount rate	5.00%