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Segment Reporting (Tables)
 12 Months Ended
Dec. 31, 2016
Segment Reporting [Abstract]  
Schedule of Company's Revenue and Income From Operations by Segment
The following table includes results for the Company’s revenue and income from operations by segment for the years ended December 31, 2016 and 2015. Prior to 2015, the Company had one operating segment.
 
Year Ended December 31, 2016
Conventional
Tanker
Segment
$
 
Ship-to-Ship
Transfer
Segment
$
 
Inter-segment
Adjustment (1)
$
 
Total
$
Revenues
488,961

 
41,136

 
(3,201
)
 
526,896

Voyage expenses
(58,442
)
 
—

 
3,201

 
(55,241
)
Vessel operating expenses
(150,100
)
 
(32,498
)
 
—

 
(182,598
)
Time-charter hire expense
(57,368
)
 
(2,279
)
 
—

 
(59,647
)
Depreciation and amortization
(99,024
)
 
(5,125
)
 
—

 
(104,149
)
General and administrative expenses
(14,444
)
 
(3,767
)
 
—

 
(18,211
)
(Loss) gain on sale of vessels
(20,926
)
 
332

 
—

 
(20,594
)
Income (loss) from operations (2)
88,657


(2,201
)
 
—

 
86,456

Equity income
13,101

 
—

 
—

 
13,101

(1)
The ship-to-ship transfer segment provides lightering support services to the conventional tanker segment for full service lightering operations and the pricing for such services is based on estimated costs incurred of approximately $25,000 per voyage.
(2)
Includes direct general and administrative expenses and indirect general and administrative expenses (allocated to each segment based on estimated use of corporate resources). 

Year Ended December 31, 2015
Conventional
Tanker
Segment
$
 
Ship-to-Ship
Transfer
Segment
$
 
Inter-segment
Adjustment (1)
$
 
Total
$
Revenues
496,455

 
18,587

 
(849
)
 
514,193

Voyage expenses
(19,468
)
 
(348
)
 
—

 
(19,816
)
Vessel operating expenses
(123,572
)
 
(14,441
)
 
849

 
(137,164
)
Time-charter hire expense
(74,860
)
 
(38
)
 
—

 
(74,898
)
Depreciation and amortization
(72,118
)
 
(1,642
)
 
—

 
(73,760
)
General and administrative expenses
(15,369
)
 
(1,985
)
 
—

 
(17,354
)
Gain on sale of vessel
771

 
—

 
—

 
771

Restructuring charge
(4,445
)
 
(327
)
 
—

 
(4,772
)
Income (loss) from operations (2)
187,394

 
(194
)
 
—

 
187,200

Equity income
14,411

 
—

 
—

 
14,411

(1)
The ship-to-ship transfer segment provides lightering support services to the conventional tanker segment for full service lightering operations and the pricing for such services is based on estimated costs incurred of approximately $25,000 per voyage.
(2)
Includes direct general and administrative expenses and indirect general and administrative expenses (allocated to each segment based on estimated use of corporate resources). 
Reconciliation of Total Segment Assets to Total Assets Presented in Consolidated Balance Sheets
A reconciliation of total segment assets to total assets presented in the accompanying consolidated balance sheets is as follows:
 
As at
December 31, 2016
$
 
As at
December 31, 2015
$
Conventional Tanker
1,807,602

 
2,020,317

Ship-to-Ship Transfer
26,468

 
24,429

Cash and cash equivalents
68,108

 
96,417

Accounts receivable
30,247

 
28,313

Total assets
1,932,425

 
2,169,476