Changes in Operations (Tables)

3 Months Ended

Mar. 31, 2015

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		2014
Operating revenues	$	553,649	$	576,060
Net income	$	47,789	$	24,981
Basic earnings per common share	$	0.86	$	0.46
Diluted earnings per common share	$	0.84	$	0.44

Freightliner [Member]

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]

The following preliminary acquisition-date fair values were assigned to the acquired net assets (dollars in thousands):

	GBP		USD
Cash and cash equivalents	£	33,815	$	50,371
Accounts receivable	50,531		75,271
Materials and supplies	9,740		14,509
Prepaid expenses and other	15,318		22,818
Property and equipment	160,500		239,081
Goodwill	193,281		287,911
Intangible assets	360,100		536,405
Other assets	351		523
Total assets	823,636		1,226,889
Current portion of long-term debt	13,946		20,774
Accounts payable and accrued expenses	91,241		135,913
Long-term debt, less current portion	39,738		59,194
Deferred income tax liabilities, net	128,664		191,658
Deferred items-grants from outside parties	838		1,248
Other long-term liabilities	33,169		49,409
Net assets	£	516,040	$	768,693

RCP&E [Member]

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]

The following acquisition-date fair values were assigned to the acquired net assets (dollars in thousands):

Materials and supplies	$	3,621
Prepaid expenses and other	116
Property and equipment	217,032
Deferred income tax assets	325
Total assets	221,094
Current portion of long-term debt	1,121
Accounts payable and accrued expenses	108
Long-term debt, less current portion	1,260
Net assets	$	218,605