Goodwill and Other Intangibles (Amortizable Intangibles) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Amortizable intangible assets, cost	$ 51,532	$ 51,627
Amortizable intangible assets, accumulated amortization expense	(31,027)	(29,013)
Net amortizable intangible assets	20,505	22,614
Favorable Leases [Member]
Amortizable intangible assets, cost	50,910	50,910
Amortizable intangible assets, accumulated amortization expense	(30,650)	(28,566)
Net amortizable intangible assets	20,260	22,344
Noncompete Agreements [Member]
Amortizable intangible assets, cost	622	717
Amortizable intangible assets, accumulated amortization expense	(377)	(447)
Net amortizable intangible assets	245	270
Unfavorable Leases [Member]
Amortizable intangibles, cost	49,380	49,380
Amortizable intangibles, accumulated amortization benefit	34,629	32,210
Net amortizable intangibles	$ 14,751	$ 17,170