Share-Based Compensation Plan (Tables)

3 Months Ended

Mar. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of restricted share activity

The following table provides a summary of service condition share activity as of March 31, 2013:

	Shares		Weighted-Average Grant Date Fair Value
Unvested at January 1, 2013	128,622		$	22.19
Granted	59,245		$	24.74
Vested	(65,192	)	$	21.96
Forfeited	—		$	—
Unvested at March 31, 2013	122,675		$	23.65