Leases (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($) option	Jun. 30, 2019 USD ($) option	Dec. 31, 2018 USD ($)
Lessee, Lease, Description [Line Items]
Options for renewal | option	1	1
Assets and Liabilities, Lessee [Abstract]
Total right-of-use assets - net	$ 65,862	$ 65,862
Current lease liabilities	12,973	12,973	$ 0
Noncurrent lease liabilities	54,619	54,619	0
Total lease liabilities	67,592	67,592
Lease, Cost [Abstract]
Operating lease cost	6,195	11,570
Variable lease cost	625	1,218
Total lease expense	6,820	12,788
Cash paid for amounts included in the measurement of operating lease liabilities		6,071
Right-of-use assets obtained in exchange for new operating lease liabilities		4,180
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2019 (excluding the six months ended June 30, 2019)	7,620	7,620
2020	13,609	13,609
2021	11,609	11,609
2022	8,820	8,820
2023	6,857	6,857
Thereafter	30,837	30,837
Total lease payments	79,352	79,352
Less: Imputed interest	(11,760)	(11,760)
Legally binding minimum lease payments for leases signed but not yet commenced	25,200	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	59,226	59,226
Equipment
Assets and Liabilities, Lessee [Abstract]
Total right-of-use assets - net	$ 6,636	$ 6,636
Building and Equipment
Lease, Cost [Abstract]
Weighted-average remaining lease term (years): Operating leases	8 years 3 months 25 days	8 years 3 months 25 days
Weighted-average discount rate: Operating leases	4.06%	4.06%
Vehicles
Lease, Cost [Abstract]
Weighted-average remaining lease term (years): Operating leases	2 years 2 months 4 days	2 years 2 months 4 days
Weighted-average discount rate: Operating leases	3.28%	3.28%