Stock Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2015

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share Based Compensation Restricted Stock Activity

A summary of our restricted stock awards from January 1, 2013 to December 31, 2015 is as follows:



	Number of Shares		Weighted- Average Grant Date Fair Value
Unvested balance at January 1, 2013	676,111		$	10.10
Granted	323,526		9.33
Additional shares from dividends	1,040		9.30
Forfeited	(16,934	)	9.65
Vested	(400,722	)	9.94
Unvested balance at December 31, 2013	583,021		9.80
Granted	249,311		12.39
Forfeited	(537	)	9.32
Vested	(317,376	)	10.19
Unvested balance at December 31, 2014	514,419		10.82
Granted	216,159		14.48
Forfeited	(183	)	9.08
Vested	(255,828	)	10.39
Unvested balance at December 31, 2015	474,567		$	12.72

Performance Stock Units

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Fair Value Valuation Assumptions

The fair values of the PSU awards are determined using a Monte Carlo simulation performed by a third-party valuation firm. The determination of the grant-date fair values of the awards granted included the following assumptions:



Award Grant Date	Volatility		Risk-Free Rate		Fair Value at Grant Date
March 3, 2013	39.2	%	0.36	%	$	9.55
May 15, 2013	37.9	%	0.40	%	$	10.41
March 3, 2014	33.5	%	0.66	%	$	12.77
May 15, 2014	33.1	%	0.80	%	$	9.88
February 27, 2015	22.9	%	1.01	%	$	12.13

Schedule of Nonvested Performance-based Units Activity

A summary of our PSUs from January 1, 2013 to December 31, 2015 is as follows:



	Number of Units	Weighted- Average Grant Date Fair Value
Unvested balance at January 1, 2013	—	$	—
Granted	217,949	9.64
Additional units from dividends	5,227	10.37
Unvested balance at December 31, 2013	223,176	9.66
Granted	200,685	12.33
Additional units from dividends	12,309	12.01
Unvested balance at December 31, 2014	436,170	10.95
Granted	218,467	12.13
Additional units from dividends	21,722	13.51
Unvested balance at December 31, 2015	676,359	$	11.41