Acquisitions Acquisitions Intangible Assets (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets Acquired	$ 60,799
Indefinite-lived Intangible Assets Acquired	18,000
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets Acquired	19,775
Noncompete Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets Acquired	13,176
Above Market Leases [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets Acquired	2,848
Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets Acquired	$ 7,000
Minimum [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life	2 years
Minimum [Member] | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life	10 years
Minimum [Member] | Noncompete Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life	2 years
Minimum [Member] | Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life	5 years
Minimum [Member] | Current Year Acquisition [Member] | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life	10 years
Minimum [Member] | Current Year Acquisition [Member] | Noncompete Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life	89 years
Minimum [Member] | Current Year Acquisition [Member] | Above Market Leases [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life	89 years
Minimum [Member] | Current Year Acquisition [Member] | Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life	89 years
Maximum [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life	89 years
Maximum [Member] | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life	20 years
Maximum [Member] | Noncompete Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life	20 years
Maximum [Member] | Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life	89 years
Maximum [Member] | Current Year Acquisition [Member] | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life	20 years
Maximum [Member] | Current Year Acquisition [Member] | Noncompete Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life	89 years
Maximum [Member] | Current Year Acquisition [Member] | Above Market Leases [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life	89 years
Maximum [Member] | Current Year Acquisition [Member] | Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life	89 years