Goodwill and Other Intangibles (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill and Other Intangibles
Goodwill increase	$ 758	$ 159
Goodwill impairment	0	0
Indefinite-lived intangible assets, other than goodwill	0	0
Amortization expense of amortizable intangible assets	$ 2,700	3,900	$ 4,000
Favorable Leases [Member]
Goodwill and Other Intangibles
Weighted-average remaining useful life of favorable leases	9 years 1 month 18 days
Unfavorable Leases [Member]
Goodwill and Other Intangibles
Weighted-average remaining useful life of unfavorable leases	4 years 1 month 23 days
Amortization benefit of unfavorable operating leases	$ 2,800	$ 3,700	$ 4,500