Earnings Per Share (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Denominator for Basic Earnings Per Share (in shares)	44,267,356	44,913,348	44,433,967	45,280,541
Dilutive Effect of Stock Options (in shares)	130,331	99,270	93,683	115,516
Dilutive Effect of Restricted Stock (in shares)	81,785	38,020	61,127	25,567
Denominator for Diluted Earnings Per Share (in shares)	44,479,472	45,050,638	44,588,777	45,421,624
Antidilutive Stock Options and Restricted Stock Outstanding	24,101	529,050	162,596	529,050