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SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Condensed Consolidating Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Condensed Financial Statements Captions [Line Items]    
Net cash provided by (used in) operating activities $ 4,631 $ (5,238)
Cash Flows From Investing Activities:    
Cash paid for acquisitions and capital expenditures, net of proceeds from divestitures and asset sales (1,774) 26,117
Net cash (used in) provided by investing activities (1,774) 26,117
Cash Flows From Financing Activities:    
Net borrowings and repayments of debt 2,593 (29,967)
Other financing activities (269) (213)
Net cash provided (used in) by financing activities 2,324 (30,180)
Net increase in cash, cash equivalents and restricted cash 5,181 (9,301)
Cash, cash equivalents and restricted cash—Beginning of period 60,090 56,767
Cash, cash equivalents and restricted cash—End of period 65,271 47,466
CFS West Virginia    
Condensed Financial Statements Captions [Line Items]    
Net cash provided by (used in) operating activities 310 12
Cash Flows From Investing Activities:    
Cash paid for acquisitions and capital expenditures, net of proceeds from divestitures and asset sales (297)  
Net cash (used in) provided by investing activities (297)  
Cash Flows From Financing Activities:    
Net borrowings and repayments of debt (13) (12)
Net cash provided (used in) by financing activities (13) (12)
Guarantor Subsidiaries    
Condensed Financial Statements Captions [Line Items]    
Net cash provided by (used in) operating activities 12,171 4,465
Cash Flows From Investing Activities:    
Cash paid for acquisitions and capital expenditures, net of proceeds from divestitures and asset sales (933) 26,796
Net cash (used in) provided by investing activities (933) 26,796
Cash Flows From Financing Activities:    
Payments from affiliates (8,513) (10,608)
Net borrowings and repayments of debt 2,679 (29,872)
Other financing activities (269) (213)
Net cash provided (used in) by financing activities (6,103) (40,693)
Net increase in cash, cash equivalents and restricted cash 5,135 (9,432)
Cash, cash equivalents and restricted cash—Beginning of period 58,406 55,453
Cash, cash equivalents and restricted cash—End of period 63,541 46,021
Non-Guarantor Subsidiaries    
Condensed Financial Statements Captions [Line Items]    
Net cash provided by (used in) operating activities 663 893
Cash Flows From Investing Activities:    
Cash paid for acquisitions and capital expenditures, net of proceeds from divestitures and asset sales (544) (679)
Net cash (used in) provided by investing activities (544) (679)
Cash Flows From Financing Activities:    
Net borrowings and repayments of debt (73) (83)
Net cash provided (used in) by financing activities (73) (83)
Net increase in cash, cash equivalents and restricted cash 46 131
Cash, cash equivalents and restricted cash—Beginning of period 1,684 1,314
Cash, cash equivalents and restricted cash—End of period 1,730 1,445
Eliminations    
Condensed Financial Statements Captions [Line Items]    
Net cash provided by (used in) operating activities (8,513) (10,608)
Cash Flows From Financing Activities:    
Payments from affiliates 8,513 10,608
Net cash provided (used in) by financing activities $ 8,513 $ 10,608