Long-term incentive plan (Tables)

3 Months Ended

Mar. 31, 2012

Long-term incentive plan

Schedule of changes in LTIP notional units

	Units			Grant Date Weighted-Average Price per Unit
Outstanding at December 31, 2011		485,781		$	11.49
Granted		209,009		$	14.65
Additional shares from dividends		8,172		$	12.02
Vested		(231,687	)	$	10.10
Outstanding at March 31, 2012		471,275		$	13.81

Schedule of assumptions for calculation of simulated total shareholder return under the Monte Carlo model

	March 31, 2012		December 31, 2011
Weighted average risk free rate of return		0.19 – 0.51%		0.15 – 0.28%
Dividend yield		8.30%		7.90%
Expected volatility—Company		22.2%		22.2%
Expected volatility—peer companies		17.1 – 112.8%		17.3 – 112.9%
Weighted average remaining measurement period		1.92 years		0.87 years