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STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
OPERATING ACTIVITIES      
Net income $ 301,699 $ 696,787 $ 455,046
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and depletion 97,330 97,209 75,413
Deferred income tax expense (benefit) 68,483 (223,038) (1,686)
Stock-based compensation expense 5,820 6,405 4,181
Amortization of debt issuance costs and debt discount, net 1,361 2,486 1,889
Accretion and valuation adjustment of ARO (7,891) (19,942) 1,834
Loss on early extinguishment of debt 9,756 0 0
Changes in operating assets and liabilities:      
Trade accounts receivable 38,928 (20,653) (51,850)
Other receivables (224) 3,872 (8,121)
Income tax receivable 21,795 (12,431) 0
Inventories (30,491) (1,812) (13,732)
Prepaid expenses and other current assets 4,088 1,444 (17,366)
Accounts payable 13,409 5,060 14,388
Accrued expenses and other current liabilities (17,317) 13,835 15,642
Non-current income tax receivable 0 17,945 (39,255)
Other 26,068 (7,771) (1,871)
Net cash provided by operating activities 532,814 559,396 434,512
INVESTING ACTIVITIES      
Purchase of property, plant and equipment (107,278) (101,620) (92,625)
Deferred mine development costs (23,392) (8,937) 0
Proceeds from sale of property, plant and equipment 3,127 2,928 0
Sale of short-term investments 17,501 0 0
Purchases of short-term investments (24,171) 0 0
Net cash used in investing activities (134,213) (107,629) (92,625)
FINANCING ACTIVITIES      
Dividends paid (240,394) (360,635) (796,902)
Proceeds from issuance of debt 0 128,750 344,750
Retirements of debt (140,272) (3,060) (3,060)
Principal repayments of capital lease obligations (17,273) 0 (505)
Debt issuance costs paid 0 (3,713) (2,562)
Common shares repurchased (12,546) (38,030) 0
Other (1,138) (4,938) 0
Net cash used in financing activities (411,623) (281,626) (458,279)
Net increase (decrease) in cash and cash equivalents and restricted cash (13,022) 170,141 (116,392)
Cash and cash equivalents and restricted cash at beginning of period 206,405 36,264 152,656
Cash and cash equivalents and restricted cash at end of period 193,383 206,405 36,264
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:      
Interest paid, net of capitalized interest 33,544 30,237 211
Cash paid for income taxes 85 3 2,349
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:      
Capital leases - equipment $ 45,523 $ 6,822 $ 7,355