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Property and Equipment and Leases (Tables)
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Line Items]  
Property and Equipment
Major classifications of property and equipment as of December 31, 2017 and 2016 were as follows (dollars in thousands):
 
 
2017
 
 
Gross Book Value
 
Accumulated Depreciation
 
Net Book Value
Property:
 
 
 
 
 
 
Land and land improvements
 
$
755,234

 
$
—

 
$
755,234

Buildings and leasehold improvements
 
257,173

 
(59,611
)
 
197,562

Bridges/tunnels/culverts
 
718,001

 
(122,380
)
 
595,621

Track property
 
2,758,946

 
(568,954
)
 
2,189,992

Total property
 
4,489,354

 
(750,945
)
 
3,738,409

Equipment:
 
 
 
 
 
 
Computer equipment
 
24,070

 
(17,852
)
 
6,218

Locomotives and railcars
 
993,872

 
(290,796
)
 
703,076

Vehicles and mobile equipment
 
77,928

 
(48,147
)
 
29,781

Signals and crossing equipment
 
75,460

 
(42,079
)
 
33,381

Track equipment
 
88,629

 
(18,873
)
 
69,756

Other equipment
 
77,271

 
(37,874
)
 
39,397

Total equipment
 
1,337,230

 
(455,621
)
 
881,609

Construction-in-process
 
36,903

 
—

 
36,903

Total property and equipment
 
$
5,863,487

 
$
(1,206,566
)
 
$
4,656,921

 
 
2016
 
 
Gross Book Value
 
Accumulated Depreciation
 
Net Book Value
Property:
 
 
 
 
 
 
Land and land improvements
 
$
735,054

 
$
—

 
$
735,054

Buildings and leasehold improvements
 
214,980

 
(43,431
)
 
171,549

Bridges/tunnels/culverts
 
692,324

 
(103,521
)
 
588,803

Track property
 
2,639,961

 
(477,366
)
 
2,162,595

Total property
 
4,282,319

 
(624,318
)
 
3,658,001

Equipment:
 
 
 
 
 
 
Computer equipment
 
20,449

 
(14,927
)
 
5,522

Locomotives and railcars
 
893,911

 
(217,704
)
 
676,207

Vehicles and mobile equipment
 
72,388

 
(41,257
)
 
31,131

Signals and crossing equipment
 
72,210

 
(37,632
)
 
34,578

Track equipment
 
48,931

 
(15,663
)
 
33,268

Other equipment
 
57,547

 
(24,845
)
 
32,702

Total equipment
 
1,165,436

 
(352,028
)
 
813,408

Construction-in-process
 
31,910

 
—

 
31,910

Total property and equipment
 
$
5,479,665

 
$
(976,346
)
 
$
4,503,319
Property and Equipment Useful Life
The Company depreciates its property and equipment using the straight-line method over the useful lives of the property and equipment. The following table sets forth the estimated useful lives of the Company's major classes of property and equipment: 
 
 
Estimated Useful Life (in Years)
 
 
Minimum
 
Maximum
Property:
 
 
 
 
Buildings and leasehold improvements (subject to term of lease)
 
2
 
40
Bridges/tunnels/culverts
 
20
 
50
Track property
 
3
 
50
 
 
Equipment:
 
 
 
 
Computer equipment
 
2
 
10
Locomotives and railcars
 
2
 
30
Vehicles and mobile equipment
 
2
 
15
Signals and crossing equipment
 
5
 
20
Track equipment
 
2
 
20
Other equipment
 
2
 
20
Railcars and Locomotives Leased
The number of railcars and locomotives leased by the Company as of December 31, 2017, 2016 and 2015 was as follows:
 
 
2017
 
2016
 
2015
Railcars
 
21,669

 
20,738

 
21,819

Locomotives
 
198

 
309

 
333
Schedule of Rent Expense
The Company's operating lease expense for equipment and real property leases and expense for the use of other railroad and other third parties' track for the years ended December 31, 2017, 2016 and 2015 was as follows (dollars in thousands):
 
 
2017
 
2016
 
2015
Equipment
 
$
80,759

 
$
91,537

 
$
91,919

Real property
 
$
17,268

 
$
14,291

 
$
12,136

Trackage rights
 
$
87,490

 
$
87,194

 
$
78,140
Schedule of Future Minimum Lease Payments for Capital Leases
The following is a summary of future minimum lease payments under capital leases and operating leases as of December 31, 2017 (dollars in thousands): 
 
 
Capital
 
Operating
 
Total
2018
 
$
9,624

 
$
100,952

 
$
110,576

2019
 
9,103

 
81,637

 
90,740

2020
 
15,593

 
67,973

 
83,566

2021
 
7,320

 
55,408

 
62,728

2022
 
12,381

 
44,893

 
57,274

Thereafter
 
20,967

 
263,653

 
284,620

Total minimum payments
 
$
74,988

 
$
614,516

 
$
689,504
Schedule of Future Minimum Lease Payments for Operating Leases
The following is a summary of future minimum lease payments under capital leases and operating leases as of December 31, 2017 (dollars in thousands): 
 
 
Capital
 
Operating
 
Total
2018
 
$
9,624

 
$
100,952

 
$
110,576

2019
 
9,103

 
81,637

 
90,740

2020
 
15,593

 
67,973

 
83,566

2021
 
7,320

 
55,408

 
62,728

2022
 
12,381

 
44,893

 
57,274

Thereafter
 
20,967

 
263,653

 
284,620

Total minimum payments
 
$
74,988

 
$
614,516

 
$
689,504
Construction-in-process [Member]  
Property, Plant and Equipment [Line Items]  
Property and Equipment
 
 
2017
 
2016
Property:
 
 
 
 
Buildings and leasehold improvements
 
$
4,209

 
$
85

Bridges/tunnels/culverts
 
1,000

 
1,600

Track property
 
5,504

 
12,302

Equipment:
 
 
 
 
Locomotives and railcars
 
18,397

 
11,786

Other equipment
 
7,793

 
6,137

Total construction-in-process
 
$
36,903

 
$
31,910