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Condensed Consolidated Statements of Stockholders' Equity (Parenthetical)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock issued for benefit plans (shares)	50,987	37,068	59,335
Options exercised (shares)	63,040	130,902	136,432
Public stock offering (shares)	0	0	4,038,270
Purchase of treasury shares (shares)	86,812	80,014	70,337
Employee stock purchase plan (shares)	42,624	49,089	66,564
Issuance of restricted stock (shares)	375,157	348,972	312,191

Number of shares of capital stock issued (purchased by employees) in connection with an employee stock ownership plan.

Number of shares issued during the period as a result of an employee stock purchase plan.

Number of new stock issued during the period.

Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.