Share-Based Compensation (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended						3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012 Restricted Stock Five Year Vesting Period [Member]	Mar. 31, 2012 Restricted Stock One Year Vesting Period [Member]	Mar. 31, 2012 Stock Options [Member]	Dec. 31, 2011 Stock Options [Member]	Mar. 31, 2012 Stock Awards [Member]	Dec. 31, 2011 Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested, beginning of period (in shares)							407,760	289,290
Nonvested, end of period (in shares)							407,760	289,290
Share-based compensation expense	$ 1,027	$ 1,060
Share-based compensation cost capitalized as part of real estate assets	22	41
Unrecognized compensation cost related to nonvested stock awards	$ 5,500
Compensation cost to be recognized over a weighted average period	3.9
Outstanding, beginning of period (in shares)					281,725
Exercised (in shares)					(128,000)
Outstanding, end of period (in shares)					153,725
Vested and exercisable, end of period (in shares)					153,725
Weighted average exercise price, outstanding, beginning of period (in dollars per share)					$ 18.28	$ 18.27
Weighted average exercise price, exercised (in dollars per share)					$ 18.27
Weighted average exercise price, outstanding, end of period (in dollars per share)					$ 18.28	$ 18.27
Weighted average exercise price, vested and exercisable, end of period (in dollars per share)					$ 18.28
Granted (in shares)							205,750
Vested (in shares)							(86,010)
Forfeited (in shares)							(1,270)
Weighted average grant date fair value, nonvested, beginning of period (in dollars per share)							$ 17.10	$ 16.09
Weighted average grant date fair value, granted (in dollars per share)							$ 18.34
Weighted average grant date fair value, vested (in dollars per share)							$ 16.66
Weighted average grant date fair value, forfeited (in dollars per share)							$ 16.58
Weighted average grant date fair value, nonvested, end of period (in dollars per share)							$ 17.10	$ 16.09
Stock Issued During Period, Shares, Restricted Stock Award, Gross			190,150	600
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			five	one