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Finite-Lived Intangible Assets and Liabilities and Goodwill (Tables)
 9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule Of Finite Lived Intangible Assets and Liability
The following presents the major components of the finite-lived intangible assets and liabilities (in thousands):
 
 
September 30, 2018
 
 
Weighted Average Remaining Life
 
Gross
 
Accumulated Amortization
 
Net
Intangible assets
 
 
 
 
 
 
 
 
Power purchase agreements
 
16
 
$
222,827

 
$
(26,429
)
 
$
196,398

Industrial revenue bond tax savings
 
24
 
12,778

 
(741
)
 
12,037

Other intangible assets
 
33
 
13,897

 
(1,210
)
 
12,687

Leasehold interest
 
8
 
$
66

 
$
(5
)
 
$
61

Total intangible assets
 
 
 
$
249,568

 
$
(28,385
)
 
$
221,183

Intangible liabilities
 
 
 
 
 
 
 
 
Power purchase agreement
 
14
 
$
60,300

 
$
(11,707
)
 
$
48,593

Leasehold interest
 
22
 
8,661

 
(215
)
 
8,446

Total intangible liabilities
 
 
 
$
68,961

 
$
(11,922
)
 
$
57,039


 
 
December 31, 2017
 
 
Weighted Average Remaining Life
 
Gross
 
Accumulated Amortization
 
Net
Intangible assets
 
 
 
 
 
 
 
 
Power purchase agreement
 
15
 
$
127,084

 
$
(17,611
)
 
$
109,473

Industrial revenue bond tax savings
 
24
 
12,778

 
(351
)
 
12,427

Other intangible assets
 
34
 
15,234

 
(1,086
)
 
14,148

Total intangible assets
 
 
 
$
155,096

 
$
(19,048
)
 
$
136,048

Intangible liability
 
 
 
 
 
 
 
 
Power purchase agreement
 
15
 
$
60,300

 
$
(9,106
)
 
$
51,194
Finite-lived Intangible Assets Amortization Expense
The following table presents estimated future amortization for the next five years related to the Company's finite-lived intangible assets and liabilities (in thousands):
Year ended December 31,
 
Power purchase agreements, net
 
Industrial revenue bond tax savings
 
Other intangible assets
 
Leasehold interests
2018 (remainder)
 
$
2,411

 
$
128

 
$
139

 
$
(93
)
2019
 
9,645

 
512

 
556

 
(370
)
2020
 
9,645

 
512

 
556

 
(370
)
2021
 
9,645

 
512

 
556

 
(370
)
2022
 
9,645

 
512

 
556

 
(370
)
Thereafter
 
106,876

 
9,862

 
10,278

 
(6,813
)
Schedule of Goodwill
The following table presents a reconciliation of the beginning and ending carrying amounts of goodwill (in millions):
 
 
Total
Balances at December 31, 2017
 
$
—

Net additions during the period(1)
 
60.3

Foreign currency translation adjustment
 
(3.8
)
Balances at September 30, 2018
 
$
56.5

(1) 
The Company recorded goodwill on March 7, 2018 as a result of the Japan Acquisition.