Goodwill and Other Intangibles (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill and Other Intangibles
Increase in Goodwill	$ 18,202	$ 3,659
Goodwill impairment	0	0
Increase in non-compete agreements	900	200
Indefinite-lived intangible assets, other than goodwill	0	0
Amortization expense of amortizable intangible assets	$ 1,400	1,600	$ 2,100
Favorable Leases [Member]
Goodwill and Other Intangibles
Weighted-average remaining useful life of favorable leases	8 years 4 months 24 days
Unfavorable Leases [Member]
Goodwill and Other Intangibles
Weighted-average remaining useful life of unfavorable leases	2 years 7 months 27 days
Amortization benefit of unfavorable operating leases	$ 900	$ 1,500	$ 2,100