Property and Equipment - Cost and Lives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 880,101	$ 898,530
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	15,229	22,130
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 56,008	85,317
Building and Building Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Year)	10 years
Building and Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Year)	40 years
Revenue and service equipment
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 645,808	648,648
Revenue and service equipment | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Year)	3 years
Revenue and service equipment | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Year)	15 years
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 48,682	47,482
Furniture and Fixtures [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Year)	3 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Year)	7 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 24,324	23,027
Computer software
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 90,050	$ 71,926
Computer software | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Year)	1 year
Computer software | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Year)	7 years