Leases (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) option	Dec. 31, 2018 USD ($)
Lessee, Lease, Description [Line Items]
Options for renewal | option	1
Assets and Liabilities, Lessee [Abstract]
Total right-of-use assets - net	$ 66,485
Current lease liabilities	13,194	$ 0
Noncurrent lease liabilities	54,968	0
Operating Lease, Liability	68,162
Lease, Cost [Abstract]
Operating lease cost	5,375
Variable lease cost	593
Total lease expense	5,968
Cash paid for amounts included in the measurement of operating lease liabilities	5,539
Right-of-use assets obtained in exchange for new operating lease liabilities	1,809
Operating Lease Liabilities, Payments Due [Abstract]
2019 (excluding the three months ended March 31, 2019)	11,276
2020	13,158
2021	11,161
2022	8,193
2023	6,626
Thereafter	30,123
Total lease payments	80,537
Less: Imputed interest	(12,375)
Legally binding minimum lease payments for leases signed but not yet commenced	25,200
Maturity of Lease Liabilities
2019		17,509
2020		13,162
2021		10,516
2022		7,979
2023		6,535
Thereafter		29,658
Total lease payments		$ 85,359
Building
Assets and Liabilities, Lessee [Abstract]
Total right-of-use assets - net	59,624
Equipment
Assets and Liabilities, Lessee [Abstract]
Total right-of-use assets - net	$ 6,861
Building and Equipment
Lease, Cost [Abstract]
Weighted-average remaining lease term (years): Operating leases	8 years 4 months 21 days
Weighted-average discount rate: Operating leases	4.02%
Vehicles
Lease, Cost [Abstract]
Weighted-average remaining lease term (years): Operating leases	1 year 1 month 10 days
Weighted-average discount rate: Operating leases	3.23%