Goodwill and Intangibles (Estimated amortization expense for intangible assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 441	$ 559	$ 535
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2013	300
2014	203
2015	166
Net Carrying Value	$ 669	$ 1,111		$ 758	$ 854	$ 985	$ 1,259	$ 1,438	$ 1,526