Condensed Consolidated Statements of Stockholders' Equity (Parenthetical)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock issued for benefit plans (shares)	104,890	50,987	37,068
Shares issued from stock option exercises	1,125	63,040	130,902
Purchase of treasury shares (shares)	98,020	86,812	80,014
Employee stock purchase plan (shares)	72,273	42,624	49,089
Issuance of restricted stock (shares)	391,581	375,157	348,972