Common Stock Incentive Plan (Tables)

12 Months Ended

Dec. 31, 2012

Common Stock Incentive Plan

Summary of common stock grant activity under Stock 2003 Plan and 2012 Plan, or the Incentive Award Plans

Our common stock grants vest over periods ranging from immediately to 10 years.

	2012		2011		2010
	Number of shares	Weighted average price(1)	Number of shares	Weighted average price(1)	Number of shares	Weighted average price(1)
Outstanding nonvested shares, beginning of year	925,526	$ 20.21	924,294	$ 19.69	853,234	$ 19.14
Shares granted	261,811	35.06	247,214	33.94	278,200	28.99
Shares vested	(290,877)	27.47	(245,487)	25.26	(206,153)	23.70
Shares forfeited	(910)	31.67	(495)	31.37	(987)	26.03
Outstanding nonvested shares, end of year	895,550	$ 19.94	925,526	$ 20.21	924,294	$ 19.69

(1) Grant date fair value.

Summary of stock option activity

	2011		2010
	Number of shares	Weighted average exercise price	Number of shares	Weighted average exercise price
Outstanding options, beginning of year	2,454	$14.70	5,846	$14.70
Options exercised	(2,454)	14.70	(3,392)	14.70
Outstanding and exercisable options, end of year	--	$       --	2,454	$14.70