Acquired Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Assets eligible for amortization:
Gross Carrying Amount	$ 16,745		$ 8,448
Accumulated Amortization	(1,398)		(816)
Unamortized intangible assets:
Goodwill	11,817	[1]	7,698	[1]
Customer Lists [Member]
Assets eligible for amortization:
Gross Carrying Amount	3,933		750
Accumulated Amortization	(1,015)		(589)
Noncompete Agreements [Member]
Assets eligible for amortization:
Gross Carrying Amount	261		0
Accumulated Amortization	(53)		0
Software [Member]
Assets eligible for amortization:
Gross Carrying Amount	234		0
Accumulated Amortization	(78)		0
Other Intangible Assets [Member]
Assets eligible for amortization:
Gross Carrying Amount	500		0
Accumulated Amortization	(25)		0
Goodwill [Member]
Assets eligible for amortization:
Accumulated Amortization	$ (227)	[1]	$ (227)	[1]

[1] Amortization through December 31, 2001 prior to adoption of FASB ASC 350.