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Plant and Equipment (Schedule Related to Property, Plant and Equipment) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Cost    
Balance, January 1 $ 130,863  
Balance, December 31 133,664 $ 130,863
Accumulated Impairment    
Balance, January 1 130,863  
Impairment reversal (note 14) 31,119  
Balance, December 31 133,664 130,863
Accumulated Depreciation    
Balance, January 1 130,863  
Impairment reversal (note 14) 31,119  
Depreciation 42,522 33,024
Balance, December 31 133,664 130,863
NET BOOK VALUE, December 31, 130,863 130,863
Gross carrying amount [member]    
Cost    
Balance, January 1 215,446 183,528
Acquisition of subsidiary   6,954
Additions 15,212 26,296
Disposals (9,006) (456)
Reclassifications (3) (876)
Balance, December 31 221,649 215,446
Accumulated Impairment    
Balance, January 1 215,446 183,528
Disposals (9,006) (456)
Balance, December 31 221,649 215,446
Accumulated Depreciation    
Balance, January 1 215,446 183,528
Disposals (9,006) (456)
Reclassifications (3) (876)
Balance, December 31 221,649 215,446
NET BOOK VALUE, December 31, 215,446 183,528
Accumulated depreciation and amortisation [member]    
Cost    
Balance, January 1 61,813 47,019
Disposals (5,045) (390)
Balance, December 31 87,985 61,813
Accumulated Impairment    
Balance, January 1 61,813 47,019
Disposals (5,045) (390)
Impairment reversal (note 14) 10,437  
Balance, December 31 87,985 61,813
Accumulated Depreciation    
Balance, January 1 61,813 47,019
Disposals (5,045) (390)
Impairment reversal (note 14) 10,437  
Depreciation 20,780 15,184
Balance, December 31 87,985 61,813
NET BOOK VALUE, December 31, 61,813 47,019
Accumulated impairment [member]    
Cost    
Balance, January 1 22,770 22,826
Disposals (76) (56)
Balance, December 31   22,770
Accumulated Impairment    
Balance, January 1 22,770 22,826
Disposals (76) (56)
Impairment reversal (note 14) (22,694)  
Balance, December 31   22,770
Accumulated Depreciation    
Balance, January 1 22,770 22,826
Disposals (76) (56)
Impairment reversal (note 14) (22,694)  
Balance, December 31   22,770
NET BOOK VALUE, December 31, 22,770 22,826
Machinery and Equipment [member]    
Cost    
Balance, January 1 36,045  
Reclassifications 3,907 12
Balance, December 31 34,647 36,045
Accumulated Impairment    
Balance, January 1 36,045  
Balance, December 31 34,647 36,045
Accumulated Depreciation    
Balance, January 1 36,045  
Reclassifications 3,907 12
Balance, December 31 34,647 36,045
NET BOOK VALUE, December 31, 36,045 36,045
Machinery and Equipment [member] | Gross carrying amount [member]    
Cost    
Balance, January 1 57,685 28,462
Acquisition of subsidiary   6,954
Additions 3,290 1,627
Disposals (3,461) (211)
Reclassifications 4,703 20,853
Balance, December 31 62,217 57,685
Accumulated Impairment    
Balance, January 1 57,685 28,462
Disposals (3,461) (211)
Balance, December 31 62,217 57,685
Accumulated Depreciation    
Balance, January 1 57,685 28,462
Disposals (3,461) (211)
Reclassifications 4,703 20,853
Balance, December 31 62,217 57,685
NET BOOK VALUE, December 31, 57,685 28,462
Machinery and Equipment [member] | Accumulated depreciation and amortisation [member]    
Cost    
Balance, January 1 17,864 14,816
Disposals (2,549) (199)
Balance, December 31 27,570 17,864
Accumulated Impairment    
Balance, January 1 17,864 14,816
Disposals (2,549) (199)
Impairment reversal (note 14) 2,449  
Balance, December 31 27,570 17,864
Accumulated Depreciation    
Balance, January 1 17,864 14,816
Disposals (2,549) (199)
Impairment reversal (note 14) 2,449  
Depreciation 5,899 3,235
Balance, December 31 27,570 17,864
NET BOOK VALUE, December 31, 17,864 14,816
Machinery and Equipment [member] | Accumulated impairment [member]    
Cost    
Balance, January 1 3,776 3,784
Disposals (1) (8)
Balance, December 31   3,776
Accumulated Impairment    
Balance, January 1 3,776 3,784
Disposals (1) (8)
Impairment reversal (note 14) (3,775)  
Balance, December 31   3,776
Accumulated Depreciation    
Balance, January 1 3,776 3,784
Disposals (1) (8)
Impairment reversal (note 14) (3,775)  
Balance, December 31   3,776
NET BOOK VALUE, December 31, 3,776 3,784
Land, Buildings and Leasehold Improvements [member]    
Cost    
Balance, January 1 82,434  
Reclassifications   2
Balance, December 31 79,385 82,434
Accumulated Impairment    
Balance, January 1 82,434  
Balance, December 31 79,385 82,434
Accumulated Depreciation    
Balance, January 1 82,434  
Reclassifications   2
Balance, December 31 79,385 82,434
NET BOOK VALUE, December 31, 82,434 82,434
Land, Buildings and Leasehold Improvements [member] | Gross carrying amount [member]    
Cost    
Balance, January 1 132,067 94,872
Additions 276 258
Disposals (1,184)  
Reclassifications 579 36,937
Balance, December 31 131,738 132,067
Accumulated Impairment    
Balance, January 1 132,067 94,872
Disposals (1,184)  
Balance, December 31 131,738 132,067
Accumulated Depreciation    
Balance, January 1 132,067 94,872
Disposals (1,184)  
Reclassifications 579 36,937
Balance, December 31 131,738 132,067
NET BOOK VALUE, December 31, 132,067 94,872
Land, Buildings and Leasehold Improvements [member] | Accumulated depreciation and amortisation [member]    
Cost    
Balance, January 1 33,479 24,466
Disposals (448)  
Balance, December 31 52,353 33,479
Accumulated Impairment    
Balance, January 1 33,479 24,466
Disposals (448)  
Impairment reversal (note 14) 6,484  
Balance, December 31 52,353 33,479
Accumulated Depreciation    
Balance, January 1 33,479 24,466
Disposals (448)  
Impairment reversal (note 14) 6,484  
Depreciation 12,838 9,011
Balance, December 31 52,353 33,479
NET BOOK VALUE, December 31, 33,479 24,466
Land, Buildings and Leasehold Improvements [member] | Accumulated impairment [member]    
Cost    
Balance, January 1 16,154 16,154
Balance, December 31   16,154
Accumulated Impairment    
Balance, January 1 16,154 16,154
Impairment reversal (note 14) (16,154)  
Balance, December 31   16,154
Accumulated Depreciation    
Balance, January 1 16,154 16,154
Impairment reversal (note 14) (16,154)  
Balance, December 31   16,154
NET BOOK VALUE, December 31, 16,154 16,154
Furniture and Other Equipment [member]    
Cost    
Balance, January 1 6,735  
Reclassifications (3,920) (14)
Balance, December 31 2,425 6,735
Accumulated Impairment    
Balance, January 1 6,735  
Balance, December 31 2,425 6,735
Accumulated Depreciation    
Balance, January 1 6,735  
Reclassifications (3,920) (14)
Balance, December 31 2,425 6,735
NET BOOK VALUE, December 31, 6,735 6,735
Furniture and Other Equipment [member] | Gross carrying amount [member]    
Cost    
Balance, January 1 15,848 15,476
Additions 726 368
Disposals (3,006) (106)
Reclassifications (7,253) 110
Balance, December 31 6,315 15,848
Accumulated Impairment    
Balance, January 1 15,848 15,476
Disposals (3,006) (106)
Balance, December 31 6,315 15,848
Accumulated Depreciation    
Balance, January 1 15,848 15,476
Disposals (3,006) (106)
Reclassifications (7,253) 110
Balance, December 31 6,315 15,848
NET BOOK VALUE, December 31, 15,848 15,476
Furniture and Other Equipment [member] | Accumulated depreciation and amortisation [member]    
Cost    
Balance, January 1 6,748 4,387
Disposals (1,507) (64)
Balance, December 31 3,890 6,748
Accumulated Impairment    
Balance, January 1 6,748 4,387
Disposals (1,507) (64)
Impairment reversal (note 14) 1,253  
Balance, December 31 3,890 6,748
Accumulated Depreciation    
Balance, January 1 6,748 4,387
Disposals (1,507) (64)
Impairment reversal (note 14) 1,253  
Depreciation 1,316 2,439
Balance, December 31 3,890 6,748
NET BOOK VALUE, December 31, 6,748 4,387
Furniture and Other Equipment [member] | Accumulated impairment [member]    
Cost    
Balance, January 1 2,365 2,405
Disposals   (40)
Balance, December 31   2,365
Accumulated Impairment    
Balance, January 1 2,365 2,405
Disposals   (40)
Impairment reversal (note 14) (2,365)  
Balance, December 31   2,365
Accumulated Depreciation    
Balance, January 1 2,365 2,405
Disposals   (40)
Impairment reversal (note 14) (2,365)  
Balance, December 31   2,365
NET BOOK VALUE, December 31, 2,365 2,405
Transport units [member]    
Cost    
Balance, January 1 519  
Reclassifications 13  
Balance, December 31 501 519
Accumulated Impairment    
Balance, January 1 519  
Balance, December 31 501 519
Accumulated Depreciation    
Balance, January 1 519  
Reclassifications 13  
Balance, December 31 501 519
NET BOOK VALUE, December 31, 519 519
Transport units [member] | Gross carrying amount [member]    
Cost    
Balance, January 1 1,095 711
Additions 108 181
Disposals (110) (64)
Reclassifications 70 267
Balance, December 31 1,163 1,095
Accumulated Impairment    
Balance, January 1 1,095 711
Disposals (110) (64)
Balance, December 31 1,163 1,095
Accumulated Depreciation    
Balance, January 1 1,095 711
Disposals (110) (64)
Reclassifications 70 267
Balance, December 31 1,163 1,095
NET BOOK VALUE, December 31, 1,095 711
Transport units [member] | Accumulated depreciation and amortisation [member]    
Cost    
Balance, January 1 576 505
Disposals (101) (60)
Balance, December 31 662 576
Accumulated Impairment    
Balance, January 1 576 505
Disposals (101) (60)
Balance, December 31 662 576
Accumulated Depreciation    
Balance, January 1 576 505
Disposals (101) (60)
Depreciation 174 131
Balance, December 31 662 576
NET BOOK VALUE, December 31, 576 505
Equipment Under Finance Lease [member]    
Cost    
Balance, January 1 4,189  
Balance, December 31 3,785 4,189
Accumulated Impairment    
Balance, January 1 4,189  
Balance, December 31 3,785 4,189
Accumulated Depreciation    
Balance, January 1 4,189  
Balance, December 31 3,785 4,189
NET BOOK VALUE, December 31, 4,189 4,189
Equipment Under Finance Lease [member] | Gross carrying amount [member]    
Cost    
Balance, January 1 7,810 5,215
Additions   2,013
Disposals (515) (75)
Reclassifications   657
Balance, December 31 7,295 7,810
Accumulated Impairment    
Balance, January 1 7,810 5,215
Disposals (515) (75)
Balance, December 31 7,295 7,810
Accumulated Depreciation    
Balance, January 1 7,810 5,215
Disposals (515) (75)
Reclassifications   657
Balance, December 31 7,295 7,810
NET BOOK VALUE, December 31, 7,810 5,215
Equipment Under Finance Lease [member] | Accumulated depreciation and amortisation [member]    
Cost    
Balance, January 1 3,146 2,845
Disposals (440) (67)
Balance, December 31 3,510 3,146
Accumulated Impairment    
Balance, January 1 3,146 2,845
Disposals (440) (67)
Impairment reversal (note 14) 251  
Balance, December 31 3,510 3,146
Accumulated Depreciation    
Balance, January 1 3,146 2,845
Disposals (440) (67)
Impairment reversal (note 14) 251  
Depreciation 553 368
Balance, December 31 3,510 3,146
NET BOOK VALUE, December 31, 3,146 2,845
Equipment Under Finance Lease [member] | Accumulated impairment [member]    
Cost    
Balance, January 1 475 483
Disposals (75) (8)
Balance, December 31   475
Accumulated Impairment    
Balance, January 1 475 483
Disposals (75) (8)
Impairment reversal (note 14) (400)  
Balance, December 31   475
Accumulated Depreciation    
Balance, January 1 475 483
Disposals (75) (8)
Impairment reversal (note 14) (400)  
Balance, December 31   475
NET BOOK VALUE, December 31, 475 483
Capital Work in Progress [member]    
Cost    
Balance, January 1 941  
Balance, December 31 12,921 941
Accumulated Impairment    
Balance, January 1 941  
Balance, December 31 12,921 941
Accumulated Depreciation    
Balance, January 1 941  
Balance, December 31 12,921 941
NET BOOK VALUE, December 31, 941 941
Capital Work in Progress [member] | Gross carrying amount [member]    
Cost    
Balance, January 1 941 38,792
Additions 10,812 21,849
Disposals (730)  
Reclassifications 1,898 (59,700)
Balance, December 31 12,921 941
Accumulated Impairment    
Balance, January 1 941 38,792
Disposals (730)  
Balance, December 31 12,921 941
Accumulated Depreciation    
Balance, January 1 941 38,792
Disposals (730)  
Reclassifications 1,898 (59,700)
Balance, December 31 12,921 941
NET BOOK VALUE, December 31, $ 941 $ 38,792