Right-of-Use ("ROU") Assets and Lease Liabilities - Operating and Finance Lease Liability (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019 renewal_option	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Leases [Abstract]
Number of renewal options | renewal_option	1
Rent Expense		$ 37,300	$ 33,400
Operating leases:
Right-of-use asset		120,562	0
Operating lease liability		120,068
Finance leases:
Vehicle and equipment ROU assets, gross		9,204
Accumulated depreciation		(2,562)
Total vehicle and equipment ROU assets, net		6,642
Total vehicle and equipment lease liability		7,384
Real estate
Operating leases:
Operating Lease, right-of-use asset		130,746
Operating lease, accumulated amortization		(24,743)
Right-of-use asset		106,003
Operating lease liability		105,559
Vehicles and equipment
Operating leases:
Operating Lease, right-of-use asset		17,416
Operating lease, accumulated amortization		(2,857)
Right-of-use asset		14,559
Operating lease liability		14,509
United States
Operating leases:
Right-of-use asset		104,938	0
Operating lease liability		104,356
Finance leases:
Vehicle and equipment ROU assets, gross		6,341
Accumulated depreciation		(1,892)
Total vehicle and equipment ROU assets, net		4,449
Total vehicle and equipment lease liability		4,777
United States | Real estate
Operating leases:
Operating Lease, right-of-use asset		114,202
Operating lease, accumulated amortization		(21,337)
Right-of-use asset		92,865
Operating lease liability		92,319
United States | Vehicles and equipment
Operating leases:
Operating Lease, right-of-use asset		14,665
Operating lease, accumulated amortization		(2,592)
Right-of-use asset		12,073
Operating lease liability		12,037
CANADA
Operating leases:
Right-of-use asset		15,624	$ 0
Operating lease liability		15,712
Finance leases:
Vehicle and equipment ROU assets, gross		2,863
Accumulated depreciation		(670)
Total vehicle and equipment ROU assets, net		2,193
Total vehicle and equipment lease liability		2,607
CANADA | Real estate
Operating leases:
Operating Lease, right-of-use asset		16,544
Operating lease, accumulated amortization		(3,406)
Right-of-use asset		13,138
Operating lease liability		13,240
CANADA | Vehicles and equipment
Operating leases:
Operating Lease, right-of-use asset		2,751
Operating lease, accumulated amortization		(265)
Right-of-use asset		2,486
Operating lease liability		$ 2,472