Leases - Supplemental Operating Lease Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Leases [Abstract]
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 14,573
Operating Lease, Weighted Average Remaining Lease Term	8 years 11 months
Operating Lease, Weighted Average Discount Rate, Percent	5.55%