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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2018
Income Tax Disclosure [Abstract]  
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]
The components of income before income taxes for the years ended December 31, 2018, 2017 and 2016 were as follows (dollars in thousands): 
 
 
2018
 
2017
 
2016
United States
 
$
291,058

 
$
262,969

 
$
273,361

Foreign
 
27,803

 
32,550

 
(57,870
)
Total
 
$
318,861

 
$
295,519

 
$
215,491

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
The components of the provision for/(benefit from) income taxes for the years ended December 31, 2018, 2017 and 2016 were as follows (dollars in thousands):
 
 
2018
 
2017
 
2016
United States:
 
 
 
 
 
 
Current
 
 
 
 
 
 
Federal
 
$
13,616

 
$
23,182

 
$
20,877

State
 
12,635

 
14,626

 
11,284

Deferred
 
 
 
 
 
 
Federal
 
15,843

 
(326,190
)
 
43,820

State
 
(1,350
)
 
19,808

 
2,263

 
 
40,744

 
(268,574
)
 
78,244

Foreign:
 
 
 
 
 
 
Current
 
17,955

 
18,435

 
3,289

Deferred
 
5,836

 
(11,120
)
 
(7,138
)
 
 
23,791

 
7,315

 
(3,849
)
Total
 
$
64,535

 
$
(261,259
)
 
$
74,395

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
The following is a summary of the effective income tax rate reconciliation for the years ended December 31, 2018, 2017 and 2016: 
 
 
2018
 
2017
 
2016
Tax provision at statutory rate
 
21.0
 %
 
35.0
 %
 
35.0
 %
Effect of foreign operations
 
4.8
 %
 
(1.1
)%
 
4.3
 %
Foreign valuation allowance
 
 %
 
(0.3
)%
 
2.9
 %
Foreign goodwill impairment
 
 %
 
 %
 
2.4
 %
Effect of foreign tax rate change
 
 %

 %
 
(2.0
)%
Effect of U.S. transition (toll) tax
 
0.5
 %
 
7.2
 %
 
 %
Effect of U.S. federal rate change
 
 %
 
(133.3
)%
 
 %
State income taxes, net of federal income tax benefit
 
3.0
 %
 
3.8
 %
 
4.1
 %
Benefit of track maintenance credit
 
(9.9
)%
 
 %
 
(13.4
)%
Other, net
 
0.8
 %
 
0.3
 %
 
1.2
 %
Effective income tax rate
 
20.2
 %
 
(88.4
)%
 
34.5
 %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
The components of net deferred income taxes as of December 31, 2018 and 2017 were as follows (dollars in thousands):
 
 
2018
 
2017
Deferred income tax assets:
 
 
 
 
Track maintenance credit carryforward
 
$
152,300

 
$
147,907

Net operating loss carryforwards
 
18,466

 
27,241

Accruals and reserves not deducted for tax purposes until paid
 
9,789

 
11,375

Stock-based compensation
 
8,832

 
8,634

Deferred revenue
 
11,363

 
4,588

Deferred compensation
 
3,794

 
3,496

Interest rate swaps
 
2,257

 
545

Alternative minimum tax credit carryforward
 

 
1,592

Pension and postretirement benefits
 
12,079

 
24,889

Foreign interest expense carryforward
 
2,593

 

Unrealized loss on exchange rates
 
2,334

 
4,251

Other
 
698

 
1,992

 
 
224,505

 
236,510

Valuation allowance
 
(16,559
)
 
(26,704
)
Deferred income tax liabilities:
 
 
 
 
Property and equipment basis difference
 
(737,500
)
 
(703,950
)
Intangible assets basis difference
 
(342,639
)
 
(374,856
)
Other
 
(912
)
 
(851
)
Net deferred tax liabilities
 
$
(873,105
)
 
$
(869,851
)
Summary of Valuation Allowance [Table Text Block]
A reconciliation of the beginning and ending amount of the Company's valuation allowance is as follows (dollars in thousands):
 
 
2018
 
2017
Balance at beginning of year
 
$
26,704

 
$
24,075

(Decrease in)/increase for state net operating losses
 
(159
)
 
1,964

(Decrease in)/increase for foreign net operating losses and impairments
 
(9,986
)
 
665

Balance at end of year
 
$
16,559

 
$
26,704

Summary of Income Tax Contingencies [Table Text Block]
A reconciliation of the beginning and ending amount of the Company's liability for uncertain tax positions is as follows (dollars in thousands):
 
 
2018
 
2017
 
2016
Balance at beginning of year
 
$
3,970

 
$
7,125

 
$
4,197

Increase for tax positions related to prior years
 

 

 
3,970

Decrease for tax positions related to prior years
 

 

 
(1,169
)
Decrease for expiration of statute of limitations
 

 
(3,155
)
 

Increase for effects of foreign exchange rates
 

 

 
127

Balance at end of year
 
$
3,970

 
$
3,970

 
$
7,125

Summary of Income Tax Examinations [Table Text Block]
As of December 31, 2018, the following tax years remain open to examination by the major taxing jurisdictions to which the Company is subject: 
 
 
Open Tax Years
 
 
From
 
To
United States
 
2015
-
2018
Australia
 
2011
-
2018
Belgium
 
2016
-
2018
Canada
 
2009
-
2018
Germany
 
2014
-
2018
Netherlands
 
2012
-
2018
Poland
 
2013
-
2018
Saudi Arabia
 
2015
-
2018
U.K.
 
2015
-
2018