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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Cash generated from (used in) operating activities:    
Profit for the year $ 85,416 $ 139,692
Tax expense 85,421 33,219
Items not affecting cash:    
Depreciation and amortization 333,144 297,825
Share- based payment (recoveries) expenses (2,373) 15,919
Net finance expense 143,550 166,593
Change in fair value of derivatives (1,514) 1,790
Amortization of deferred revenue (93,382) (88,744)
Change in taxes receivable/payable, net (7,881) (39,326)
Unrealized (gain) on warrants (6,748) (1,051)
(Gain) loss on investments 3,798 (3,511)
Pension and other employee benefit payments, net of accruals (94) 3,142
Asset impairment losses   11,320
Other and foreign exchange (8,571) 4,310
Taxes paid (37,295) (10,617)
Operating cash flow before change in non-cash working capital 493,471 530,561
Change in non-cash working capital (13,919) 9,015
Net cash flows from (used in) operating activities 479,552 539,576
Cash generated from (used in) investing activities:    
Acquisition of property, plant and equipment (190,899) (249,763)
Net sale (purchase) of investments 53 (2,245)
Acquisition of Mason (19,050)  
Proceeds from disposition of property, plant and equipment 4,224  
Change in restricted cash (3,196) 16,854
Net interest received 6,732 890
Net cash flows from (used in) investing activities (202,136) (234,264)
Cash generated from (used in) financing activities:    
Long term borrowing   25,000
Principal repayments   (281,439)
Interest paid on long-term debt (74,750) (52,743)
Financing costs (20,564) (26,597)
Sale leaseback   67,275
Payment of finance lease (20,926) (7,509)
Net proceeds from equity transactions (69) 186,852
Dividends paid (4,045) (3,686)
Net cash flows from (used in) financing activities (120,354) (92,847)
Effect of movement in exchange rates on cash and cash equivalents 1,936 (2,830)
Net increase in cash and cash equivalents 158,998 209,635
Cash and cash equivalents, beginning of the year 356,499 146,864
Cash and cash equivalents, end of the year $ 515,497 $ 356,499