Changes in Operations (Tables)

6 Months Ended

Jun. 30, 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):

	Six Months Ended June 30, 2015
Operating revenues	$	1,095,868
Net income	$	100,626
Basic earnings per common share	$	1.80
Diluted earnings per common share	$	1.76