Segment Information (Tables)

3 Months Ended

Mar. 31, 2015

Segment Reporting [Abstract]

Schedule of segment reporting information, by segment [Table Text Block]

The following tables set forth the Company's operating segments for the three months ended March 31, 2015 and 2014 (dollars in thousands):

	Three Months Ended March 31, 2015
	North American & European Operations		Australian Operations		Freightliner (5 business days)		Total Operations
Operating revenues	$	322,744	$	59,151	$	15,135	$	397,030
Income from operations	$	56,896	$	14,588	$	1,136	$	72,620
Depreciation and amortization	$	35,651	$	6,162	$	—	$	41,813
Interest expense	$	11,017	$	2,345	$	146	$	13,508
Loss on settlement of foreign currency forward purchase contracts	$	16,374	$	2,312	$	—	$	18,686
Interest income	$	13	$	8	$	5	$	26
Provision for income taxes	$	13,685	$	2,928	$	249	$	16,862
Expenditures for additions to property & equipment, net of grants from outside parties	$	45,283	$	4,615	$	—	$	49,898

	Three Months Ended March 31, 2014
	North American & European Operations		Australian Operations		Total Operations
Operating revenues	$	299,987	$	76,292	$	376,279
Income from operations	$	55,690	$	19,185	$	74,875
Depreciation and amortization	$	30,579	$	7,062	$	37,641
Interest expense	$	9,445	$	4,196	$	13,641
Interest income	$	902	$	132	$	1,034
Provision for income taxes	$	18,457	$	4,443	$	22,900
Expenditures for additions to property & equipment, net of grants from outside parties	$	53,985	$	4,833	$	58,818

Property & equipment by segment [Table Text Block]

The following tables set forth the property and equipment recorded in the consolidated balance sheets for the Company's operating segments as of March 31, 2015 and December 31, 2014 (dollars in thousands):

	March 31, 2015
	North American & European Operations		Australian Operations		Freightliner		Total Operations
Property and equipment, net	$	3,307,854	$	468,963	$	238,039	$	4,014,856

	December 31, 2014
	North American & European Operations		Australian Operations		Total Operations
Property and equipment, net	$	3,282,328	$	506,154	$	3,788,482

Revenue from external customers by geographic areas [Table Text Block]

Operating revenues for each geographic area for three months ended March 31, 2015 and 2014 were as follows (dollars in thousands):

	Three Months Ended March 31, 2015				Three Months Ended March 31, 2014
	Amount		% of Total		Amount		% of Total
Operating revenues:
United States	$	290,419	73.1	%	$	267,772	71.2	%
Non-United States:
Australia	$	59,941	15.1	%	$	76,292	20.3	%
Canada	27,205		6.9	%	27,870		7.4	%
Europe	19,465		4.9	%	4,345		1.2	%
Total Non-United States	$	106,611	26.9	%	$	108,507	28.8	%
Total operating revenues	$	397,030	100.0	%	$	376,279	100.0	%

Long-lived assets by geographic areas [Table Text Block]

Property and equipment for each geographic area as of March 31, 2015 and December 31, 2014 were as follows (dollars in thousands):

	March 31, 2015				December 31, 2014
	Amount		% of Total		Amount		% of Total
Property and equipment located in:
United States	$	3,050,803	76.0	%	$	3,003,299	79.3	%
Non-United States:
Australia	$	469,409	11.7	%	$	506,154	13.4	%
Canada	246,018		6.1	%	266,305		7.0	%
Europe	248,626		6.2	%	12,724		0.3	%
Total Non-United States	$	964,053	24.0	%	$	785,183	20.7	%
Total property and equipment, net	$	4,014,856	100.0	%	$	3,788,482	100.0	%