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Share-based compensation (Details 2) (USD $)	3 Months Ended		9 Months Ended
Share-based compensation (Details 2) (USD $)	Sep. 30, 2011 years	Sep. 30, 2010	Sep. 30, 2011 years	Sep. 30, 2010	Dec. 31, 2010
Share-based compensation
Share-based compensation expense (in dollars)	$ 1,000,000	$ 600,000	$ 2,700,000	$ 2,000,000
Income tax benefit (in dollars)	400,000	200,000	900,000	600,000
Nonqualified stock options (NQSOs)
Share-based compensation
Lower range of exercise prices (in dollars per share)	$ 20.49		$ 20.49
Upper range of exercise prices (in dollars per share)	$ 21.68		$ 21.68
Number of options (in shares)	111,500		111,500
Weighted-average remaining contractual life (in years)	1.3		1.3
Weighted-average exercise price of options outstanding and exercisable (in dollars per share)	$ 20.70		$ 20.70
Outstanding shares (in shares)					215,500
Weighted-average exercise price (in dollars per share)					$ 20.76
Aggregate intrinsic value (in dollars)	700,000		700,000
Shares expired				2,000
Weighted-average price of shares expired (in dollars per shares)		$ 20.49		$ 20.49
Shares exercised	2,000	46,000	104,000	109,000
Weighted-average exercise price (in dollars per share)	$ 20.49	$ 21.52	$ 20.81	$ 18.48
Cash received from exercise (in dollars)	41,000	990,000	2,164,000	2,014,000
Intrinsic value of shares exercised (in dollars)	6,000	287,000	846,000	912,000
Tax benefit realized for the deduction of exercises (in dollars)	$ (85,000)	$ 81,000	$ 186,000	$ 324,000
Nonqualified stock options (NQSOs) \| 2002
Share-based compensation
Range of exercise prices (in dollars per share)	$ 21.68		$ 21.68
Number of options (in shares)	20,000		20,000
Weighted-average remaining contractual life (in years)	0.6		0.6
Weighted-average exercise price of options outstanding and exercisable (in dollars per share)	$ 21.68		$ 21.68
Nonqualified stock options (NQSOs) \| 2003
Share-based compensation
Range of exercise prices (in dollars per share)	$ 20.49		$ 20.49
Number of options (in shares)	91,500		91,500
Weighted-average remaining contractual life (in years)	1.4		1.4
Weighted-average exercise price of options outstanding and exercisable (in dollars per share)	$ 20.49		$ 20.49
Stock appreciation rights (SARs)
Share-based compensation
Lower range of exercise prices (in dollars per share)	$ 26.02		$ 26.02
Upper range of exercise prices (in dollars per share)	$ 26.18		$ 26.18
Number of options (in shares)	392,000		392,000
Weighted-average remaining contractual life (in years)	2.1		2.1
Weighted-average exercise price of shares outstanding and exercisable (in dollars per share)	$ 26.13		$ 26.13
Outstanding shares (in shares)					450,000
Weighted-average exercise price (in dollars per share)					$ 26.13
Shares expired (in shares)	18,000		58,000	18,000
Weighted-average price of shares expired (in dollars per shares)	$ 26.18		$ 26.13	$ 26.18
Stock appreciation rights (SARs) \| 2004
Share-based compensation
Range of exercise prices (in dollars per share)	$ 26.02		$ 26.02
Number of options (in shares)	132,000		132,000
Weighted-average remaining contractual life (in years)	1.6		1.6
Weighted-average exercise price of shares outstanding and exercisable (in dollars per share)	$ 26.02		$ 26.02
Stock appreciation rights (SARs) \| 2005
Share-based compensation
Range of exercise prices (in dollars per share)	$ 26.18		$ 26.18
Number of options (in shares)	260,000		260,000
Weighted-average remaining contractual life (in years)	2.4		2.4
Weighted-average exercise price of shares outstanding and exercisable (in dollars per share)	$ 26.18		$ 26.18