Goodwill and Other Intangibles (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Summary of goodwill and other intangible assets acquired
Goodwill	$ 44,577	$ 8,087
Gross carrying value of intangible assets subject to amortization	2,125	2,125
Less accumulated amortization	(1,064)	(956)
Net carrying value	1,061	1,169
Lease Related Intangibles [Member]
Summary of goodwill and other intangible assets acquired
Gross carrying value of intangible assets subject to amortization	1,345	1,345
Non-Compete Agreements [Member]
Summary of goodwill and other intangible assets acquired
Gross carrying value of intangible assets subject to amortization	30	30
Trade Names [Member]
Summary of goodwill and other intangible assets acquired
Gross carrying value of intangible assets subject to amortization	$ 750	$ 750