Summary of Significant Accounting Policies, (Details 1)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation between basic and diluted earnings per share
Weighted average common shares outstanding for the year (in shares)	32,050,538	31,708,949	31,178,813
Dilutive impact of stock equivalents (in shares)	347,827	436,824	368,778
Weighted average common and common equivalent shares for the year (in shares)	32,398,365	32,145,773	31,547,591
Common shares outstanding at December 31 (in shares)	32,184,110	31,728,969	31,032,791
Weighted average anti-dilutive shares excluded from the computation of diluted earnings per share (in shares)	402,485	189,768	470,097