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Stock and Other Incentive Plans [Tables]

12 Months Ended

Dec. 31, 2011

Stock and Other Incentive Plans [Abstract]

Summary of the activity under the Incentive Plan, and its predecessor plan, and the 1995 Director's Plan and related information


		2011				2010				2009
Stock-based awards, beginning of year			1,379,243				1,224,779				1,111,728
Granted			106,569				175,412				124,587
Vested			(44,211	)			(20,948	)			(11,536	)
Forfeited			(10,926	)			—				—

Stock-based awards, end of year			1,430,675				1,379,243				1,224,779

Weighted-average grant date fair value of:
Stock-based awards, beginning of year		$	24.71			$	25.16			$	25.71
Stock-based awards granted during the year		$	21.64			$	21.19			$	21.01
Stock-based awards vested during the year		$	20.13			$	22.60			$	32.80
Stock-based awards forfeited during the year		$	21.00			$	—			$	—
Stock-based awards, end of year		$	24.65			$	24.71			$	25.16
Grant date fair value of shares granted during the year		$	2,305,848			$	3,600,160			$	2,617,678

Summary of the Employee Stock Purchase Plan activity


		2011				2010				2009
Outstanding, beginning of year			392,517				335,608				250,868
Granted			261,960				256,080				219,184
Exercised			(13,901	)			(9,131	)			(9,803	)
Forfeited			(49,173	)			(53,504	)			(42,032	)
Expired			(166,207	)			(136,536	)			(82,609	)

Outstanding and exercisable, end of year			425,196				392,517				335,608

Weighted-average exercise price of:
Options outstanding, beginning of year		$	17.99			$	18.24			$	19.96
Options granted during the year		$	17.99			$	18.24			$	19.96
Options exercised during the year		$	16.31			$	18.19			$	15.43
Options forfeited during the year		$	17.12			$	18.69			$	16.87
Options expired during the year		$	19.34			$	19.80			$	12.74
Options outstanding, end of year		$	15.80			$	17.99			$	18.24
Weighted-average fair value of options granted during the year (calculated as of the grant date)		$	7.61			$	8.07			$	7.75
Intrinsic value of options exercised during the year		$	38,784			$	29,037			$	31,566
Intrinsic value of options outstanding and exercisable (calculated as of December 31)		$	1,186,297			$	1,248,204			$	1,080,658
Exercise prices of options outstanding (calculated as of December 31)		$	15.80			$	17.99			$	18.24
Weighted-average contractual life of outstanding options (calculated as of December 31, in years)			0.8				0.8				0.8

Fair value of options issued based on weighted-average assumptions


		2011				2010				2009
Risk-free interest rates			0.61	%			1.14	%			0.76	%
Expected dividend yields			5.35	%			5.68	%			6.05	%
Expected life (in years)			1.48				1.50				1.50
Expected volatility			64.8	%			69.5	%			58.2	%
Expected forfeiture rates			91	%			91	%			84	%

Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

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