Business Combinations (Details) - USD ($) $ in Thousands	2 Months Ended	12 Months Ended
	Mar. 11, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business acquisition [Line Items]
Investments in businesses		$ 13,244	$ 13,264	$ 4,888
Liabilities assumed		2,381	2,713	216
Debt issued		2,402	3,099	875
Goodwill		2,840	5,131	817
Goodwill acquired during period, tax deductible amount		$ 2,840	$ 5,131	$ 1,410
Subsequent event [Member]
Business acquisition [Line Items]
Liabilities assumed	$ 0
Debt issued	$ 1,092
Customer lists/relationships
Business acquisition [Line Items]
Intangible assets, estimated useful life (in years)		7 years
Tradenames
Business acquisition [Line Items]
Intangible assets, estimated useful life (in years)		7 years
Noncompete agreements [Member]
Business acquisition [Line Items]
Intangible assets, estimated useful life (in years)		5 years