The following table sets forth the computation of basic and diluted earnings per common share utilizing the two-class method.

Earnings Per Share

(in thousands except per share data)	Three Months Ended June 30, 2018		Three Months Ended June 30, 2017		Six Months Ended June 30, 2018		Six Months Ended June 30, 2017
Numerator:
Net income attributable to common shareholders	$	39,274	$	19,355	$	73,163	$	39,785
Denominator:
Denominator for basic earnings per share – weighted average shares		46,481		46,365		46,467		46,335
Effect of Dilutive Securities:
Stock options and non-vested stock		95		113		90		113
Denominator for diluted earnings per share – adjusted weighted average shares and assumed conversion		46,576		46,478		46,557		46,448
Basic earnings per common share attributable to common shareholders	$	0.84	$	0.42	$	1.57	$	0.86
Diluted earnings per common share attributable to common shareholders	$	0.84	$	0.42	$	1.57	$	0.86

Earnings Per Unit

The following table sets forth the computation of basic and diluted earnings per common unit utilizing the two-class method.

(in thousands except per unit data)	Three Months Ended June 30, 2018		Three Months Ended June 30, 2017		Six Months Ended June 30, 2018		Six Months Ended June 30, 2017
Numerator:
Net income attributable to common unitholders	$	39,274	$	19,355	$	73,163	$	39,785
Denominator:
Denominator for basic earnings per unit – weighted average units		46,481		46,365		46,467		46,335
Effect of Dilutive Securities:
Stock options and non-vested stock		95		113		90		113
Denominator for diluted earnings per unit – adjusted weighted average units and assumed conversion		46,576		46,478		46,557		46,448
Basic earnings per common unit attributable to common unitholders	$	0.84	$	0.42	$	1.57	$	0.86
Diluted earnings per common unit attributable to common unitholders	$	0.84	$	0.42	$	1.57	$	0.86