Leases (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($) option	Sep. 30, 2019 USD ($) option	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Lessee, Lease, Description [Line Items]
Options for renewal | option	1	1
Assets and Liabilities, Lessee [Abstract]
Total right-of-use assets - net	$ 64,860	$ 64,860
Current lease liabilities	13,919	13,919		$ 0
Noncurrent lease liabilities	53,284	53,284		0
Total lease liabilities	67,203	67,203
Asset impairments	9,700	9,680	$ 0
Lease, Cost [Abstract]
Operating lease cost	4,817	16,387
Variable lease cost	436	1,654
Total lease expense	5,253	18,041
Cash paid for amounts included in the measurement of operating lease liabilities		15,813
Right-of-use assets obtained in exchange for new operating lease liabilities		6,899
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2019 (excluding the nine months ended September 30, 2019)	4,356	4,356
2020	15,324	15,324
2021	12,373	12,373
2022	9,373	9,373
2023	7,083	7,083
Thereafter	31,199	31,199
Total lease payments	79,708	79,708
Less: Imputed interest	(12,505)	(12,505)
Legally binding minimum lease payments for leases signed but not yet commenced	31,300	31,300
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 right-of-use asset
Assets and Liabilities, Lessee [Abstract]
Asset impairments	600
Building
Assets and Liabilities, Lessee [Abstract]
Total right-of-use assets - net	58,183	58,183
Equipment
Assets and Liabilities, Lessee [Abstract]
Total right-of-use assets - net	$ 6,677	$ 6,677
Building and Equipment
Lease, Cost [Abstract]
Weighted-average remaining lease term (years): Operating leases	7 years 11 months 19 days	7 years 11 months 19 days
Weighted-average discount rate: Operating leases	4.02%	4.02%
Vehicles
Lease, Cost [Abstract]
Weighted-average remaining lease term (years): Operating leases	2 years 2 months 23 days	2 years 2 months 23 days
Weighted-average discount rate: Operating leases	3.09%	3.09%