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Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
Changes in Fair Value for Partnership's Contingent Consideration Liability Measured Recurring Basis Using Significant Unobservable Inputs (Level 3)
Changes in the estimated fair value of the Partnership’s contingent consideration liability relating to the acquisition of Logitel, which is measured at fair value on a recurring basis using significant unobservable inputs (Level 3), during the years ended December 31, 2018, 2017 and 2016, are as follows:

 
 
Year Ended
December 31,
2018
$
 
Year Ended
December 31,
2017
$
 
Year Ended
December 31,
2016
$
Balance at beginning of period
 

 

 
(14,830
)
Acquisition of Logitel
 

 

 

Settlement of liability
 

 

 

Gain included in Other income (expense) - net
 

 

 
14,830

Balance at end of period
 

 

 

Estimated Fair Value of Financial Instruments Measured at Fair Value on Recurring Basis
The following table includes the estimated fair value and carrying value of those assets and liabilities that are measured at fair value on a recurring and non-recurring basis, as well as the estimated fair value of the Partnership’s financial instruments that are not accounted for at fair value on a recurring basis:
 
 
 
 
December 31, 2018
 
December 31, 2017
 
 
Fair Value Hierarchy Level
 
Carrying Amount
Asset (Liability)
$
 
Fair Value Asset (Liability)
$
 
Carrying Amount
Asset (Liability)
$
 
Fair Value Asset (Liability)
$
Recurring:
 
 
 
 
 
 
 
 
 
 
Cash and cash equivalents and restricted cash
 
Level 1
 
233,580


233,580


250,294


250,294

Derivatives instruments (note 12)
 

 








Interest rate swap agreements
 
Level 2
 
(107,074
)

(107,074
)

(168,247
)

(168,247
)
Cross currency swap agreement
 
Level 2
 
(4,538
)

(4,538
)

(44,006
)

(44,006
)
Foreign currency forward contracts
 
Level 2
 
(4,650
)

(4,650
)

(357
)

(357
)
 
 

 








Other:
 

 








Long-term debt - public (note 8)
 
Level 1
 
(1,027,696
)

(977,917
)

(666,427
)

(671,635
)
Long-term debt - non-public (note 8)
 
Level 2
 
(2,070,046
)

(2,082,316
)

(2,457,301
)

(2,475,946
)
Due to affiliates - current (note 11h)
 
Level 2
 
(125,000
)

(123,025
)




Due to affiliates - long term (note 11f)
 
Level 2
 

 

 
(163,037
)
 
(210,089
)
Summary of Partnership's Financing Receivables
The following table contains a summary of the Partnership’s financing receivables by type of borrower and the method by which the Partnership monitors the credit quality of its financing receivables on a quarterly basis:

 
 
Credit Quality Indicator
 
Grade
 
Year Ended
December 31,
2018
$
 
Year Ended
December 31,
2017
$
Direct financing leases
 
Payment activity
 
Performing
 
4,793

 
17,207