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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

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