Summary of Significant Accounting Policies, (Details 1)	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Reconciliation between basic and diluted earnings per share
Weighted average common shares outstanding for the year (in shares)	31,708,949	[1]	31,178,813	[1]	30,764,282
Dilutive impact of stock equivalents (in shares)	436,824		368,778		269,432
Weighted average common and common equivalent shares for the year (in shares)	32,145,773	[1]	31,547,591	[1]	31,033,714
Common shares outstanding at December 31 (in shares)	31,728,969		31,032,791		30,773,908
Weighted average anti-dilutive shares excluded from the computation of diluted earnings per share (in shares)	189,768		470,097		938,546

[1] Restated