Earnings Per Common Share (Reconciliation Of Number Of Common Shares Used In Calculating Basic And Diluted EPS) (Details) (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Earnings from continuing operations	$ 8,449	$ 11,828	$ 16,145	$ 13,212
Basic average common shares outstanding	40,174,000	39,972,000	40,127,000	39,930,000
Diluted average common shares outstanding	40,378,000	40,211,000	40,339,000	40,164,000
Basic earnings per common share from continuing operations	$ 0.21	$ 0.29	$ 0.40	$ 0.33
Diluted earnings per common share from continuing operations	$ 0.21	$ 0.29	$ 0.40	$ 0.33
Total anti-dilutive shares excluded from the calculation	77,767	81,912	94,320	81,912
Common Stock Options [Member]
Incremental shares	58,435	110,450	58,462	102,361
Performance Shares [Member]
Incremental shares	115,310	95,597	123,251	99,859
Total anti-dilutive shares excluded from the calculation	77,767	81,162	77,767	81,162
Restricted Stock Units [Member]
Incremental shares	30,088	32,835	30,788	31,450
Total anti-dilutive shares excluded from the calculation		750	16,553	750