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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Operating activities    
Net income $ 135,581 $ 103,291
Adjustments to reconcile to cash provided by operating activities:    
Depreciation, depletion and amortization 51,797 60,252
Accretion on asset retirement obligations 10,274 13,985
Amortization of sales contracts, net 76 6,299
Deferred income taxes 13,385 8,730
Employee stock-based compensation expense 11,473 7,992
(Gains) losses on disposals and divestitures, net (1,415) 131
Net loss resulting from early retirement of debt and debt restructuring 0 485
Amortization relating to financing activities 1,826 2,170
Changes in:    
Receivables 17,871 (20,212)
Inventories (47,370) (28,245)
Accounts payable, accrued expenses and other current liabilities 4,497 (11,879)
Income taxes, net 24,575 11,560
Other 3,336 (9,563)
Cash provided by operating activities 225,906 144,996
Investing activities    
Capital expenditures (87,854) (30,049)
Minimum royalty payments (1,125) (124)
Proceeds from disposals and divestitures 1,591 56
Purchases of short term investments (89,454) (110,359)
Proceeds from sales of short term investments 90,424 105,150
Investments in and advances to affiliates, net (3,275) 0
Cash used in investing activities (89,693) (35,326)
Financing activities    
Payments on term loan due 2024 (1,500) (1,500)
Net payments on other debt (8,845) (7,307)
Debt financing costs 0 (529)
Net loss resulting from early retirement of debt and debt restructuring 0 (50)
Dividends paid (15,264) (16,333)
Purchases of treasury stock (143,142) (115,973)
Other 30 10
Cash used in financing activities (168,721) (141,682)
Decrease in cash and cash equivalents, including restricted cash (32,508) (32,012)
Cash and cash equivalents, including restricted cash, beginning of period 264,937 273,602
Cash and cash equivalents, including restricted cash, end of period 232,429 241,590
Cash and cash equivalents, including restricted cash, end of period    
Cash and cash equivalents, including restricted cash, end of period $ 264,937 $ 273,602