Changes in Operations (Tables)

3 Months Ended

Mar. 31, 2016

Business Acquisition, Pro Forma Information [Table Text Block]

The following pro forma financial information does not include the impact of any costs to integrate the operations or the impact of derivative instruments that the Company has entered into or may enter into to mitigate interest rate risk (dollars in thousands, except per share amounts):

	Three Months Ended
	March 31,
	2015
Operating revenues	$	553,649
Net income	$	47,789
Basic earnings per common share	$	0.86
Diluted earnings per common share	$	0.84