Right-of-Use ("ROU") Assets and Lease Liabilities - Operating and Finance Lease Liability (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($) renewal_option	Dec. 31, 2018 USD ($)
Leases [Abstract]
Number of renewal options | renewal_option	1
Operating leases:
Right-of-use asset	$ 114,653	$ 0
Operating lease liability	113,312
Finance leases included in property and equipment, net:
Vehicle and equipment ROU assets, gross	9,278
Accumulated depreciation	(1,429)
Total vehicle and equipment ROU assets, net	7,849
Total vehicle and equipment lease liability	8,722
Real Estate
Operating leases:
Operating lease, right-of-use asset	117,308
Operating lease, accumulated amortization	(12,899)
Right-of-use asset	104,409
Operating lease liability	103,121
Vehicles and equipment
Operating leases:
Operating lease, right-of-use asset	11,617
Operating lease, accumulated amortization	(1,373)
Right-of-use asset	10,244
Operating lease liability	10,191
United States
Operating leases:
Right-of-use asset	99,125	0
Operating lease liability	97,853
Finance leases included in property and equipment, net:
Vehicle and equipment ROU assets, gross	6,369
Accumulated depreciation	(988)
Total vehicle and equipment ROU assets, net	5,381
Total vehicle and equipment lease liability	5,824
United States | Real Estate
Operating leases:
Operating lease, right-of-use asset	100,769
Operating lease, accumulated amortization	(11,307)
Right-of-use asset	89,462
Operating lease liability	88,239
United States | Vehicles and equipment
Operating leases:
Operating lease, right-of-use asset	10,922
Operating lease, accumulated amortization	(1,259)
Right-of-use asset	9,663
Operating lease liability	9,614
Canada
Operating leases:
Right-of-use asset	15,528	$ 0
Operating lease liability	15,459
Finance leases included in property and equipment, net:
Vehicle and equipment ROU assets, gross	2,909
Accumulated depreciation	(441)
Total vehicle and equipment ROU assets, net	2,468
Total vehicle and equipment lease liability	2,898
Canada | Real Estate
Operating leases:
Operating lease, right-of-use asset	16,539
Operating lease, accumulated amortization	(1,592)
Right-of-use asset	14,947
Operating lease liability	14,882
Canada | Vehicles and equipment
Operating leases:
Operating lease, right-of-use asset	695
Operating lease, accumulated amortization	(114)
Right-of-use asset	581
Operating lease liability	$ 577