Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Total Cost	$ 143,166	$ 108,231
Accumulated Depreciation	(89,937)	(70,561)
Property and Equipment, net	$ 53,229	37,670
Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	1 year
Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	15 years
Computer Software and Hardware
Property, Plant and Equipment [Line Items]
Total Cost	$ 85,894	62,303
Computer Software and Hardware | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	1 year
Computer Software and Hardware | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	7 years
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Total Cost	$ 33,379	21,975
Transportation Equipment [Member]
Property, Plant and Equipment [Line Items]
Total Cost	$ 17,851	17,851
Transportation Equipment [Member] | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Transportation Equipment [Member] | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	12 years
Office Furniture and Equipment
Property, Plant and Equipment [Line Items]
Total Cost	$ 6,042	$ 6,102
Office Furniture and Equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	4 years
Office Furniture and Equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	15 years