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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating activities      
Net income (loss) $ 337,573 $ (344,615) $ 233,799
Adjustments to reconcile to cash from operating activities:      
Depreciation, depletion and amortization 120,327 121,552 111,621
Accretion on asset retirement obligations 21,748 19,887 20,548
Deferred income taxes 8 14,430 13,501
Employee stock-based compensation expense 20,539 17,435 21,989
Amortization relating to financing activities 6,549 5,599 3,691
Gain on property insurance recovery related to Mountain Laurel longwall   (23,518)  
Loss (Gain) on disposals and divestitures, net 23,276 (3,727) 8,304
Reclamation work completed (39,047) (14,357) (8,832)
Contribution to fund asset retirement obligations (20,000)    
Non-cash asset impairment and restructuring   198,007  
Preference Rights Lease Application settlement income     (39,000)
Changes in:      
Receivables (212,950) 63,657 30,713
Inventories (30,726) (9,126) (15,251)
Accounts payable, accrued expenses and other current liabilities 45,547 (46,066) (28,222)
Income taxes, net 1,820 22,859 38,152
Coal derivative assets and liabilities, including margin account (3,553) (1,045) 10,117
Asset retirement obligations (13,697) (1,787) (2,623)
Pension, postretirement and other postemployment benefits 4,571 588 (209)
Other (23,701) 41,333 21,416
Cash provided by operating activities 238,284 61,106 419,714
Investing activities      
Capital expenditures (245,440) (285,821) (266,356)
Minimum royalty payments (1,186) (1,248) (1,249)
Proceeds from disposals and divestitures 21,228 1,007 6,135
Purchases of short-term investments   (120,624) (205,216)
Proceeds from sales of short-term investments 87,486 158,708 233,074
Investments in and advances to affiliates, net (3,303) (1,549) (5,499)
Proceeds from property insurance recovery related to Mountain Laurel longwall   23,518  
Cash used in investing activities (141,215) (226,009) (239,111)
Financing activities      
Payments on term loan (7,895) (3,000) (3,000)
Proceeds from equipment financing 19,438 53,611  
Proceeds from tax exempt bonds 44,985 53,090  
Proceeds from convertible debt   155,250  
Purchase of capped call related to convertible debt   (17,543)  
Net payments on other debt (11,195) (15,922) (5,373)
Debt financing costs (2,057) (9,718) (0)
Dividends paid (3,830) (8,245) (30,220)
Purchases of treasury stock     (244,998)
Payments for taxes related to net share settlement of equity awards (4,840) (2,195) (8,961)
Proceeds from warrants exercised 1,175    
Other     32
Cash provided by (used in) financing activities 35,781 205,328 (292,520)
Increase (decrease) in cash and cash equivalents, including restricted cash 132,850 40,425 (111,917)
Cash and cash equivalents, including restricted cash, beginning of period 193,445 153,020 264,937
Cash and cash equivalents, including restricted cash, end of period 326,295 193,445 153,020
SUPPLEMENTAL CASH FLOW INFORMATION      
Cash paid during the period for interest 31,568 19,602 16,627
Restricted cash $ 1,101 5,953  
Cash refunded during the period for income taxes, net   $ 37,535 $ 52,272