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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities:    
Net income $ 15,448 $ 65,554
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 146,942 149,211
Deferred income taxes (11,486) 9,220
Gain on disposal of property and equipment (6,244) (30,229)
Non-cash equity compensation 4,621 6,291
Insurance and claims accruals, net of current portion (12,585) (5,049)
Loss on investments in equity securities, net 190 2
Loss from equity method investment 274 844
Other (6,569) (2,445)
Changes in certain working capital items:    
Accounts receivable, net 34,958 81,221
Other current assets 30,553 16,255
Accounts payable 5,269 (4,493)
Other current liabilities (3,714) (4,592)
Net cash provided by operating activities 197,657 281,790
Cash flows from investing activities:    
Additions to property and equipment (198,534) (361,312)
Proceeds from sales of property and equipment 80,338 107,121
Net cash invested in acquisition 0 (188)
Investment in equity securities (21) 0
Payment to acquire equity method investment (2,360) (2,645)
Purchase of promissory note 0 (25,000)
Decrease in notes receivable 1,168 1,707
Net cash used in investing activities (119,409) (280,317)
Cash flows from financing activities:    
Repayments of short-term debt (32,500) (3,750)
Proceeds from issuance of short-term debt 40,000 0
Repayments of long-term debt (136,250) (50,000)
Proceeds from issuance of long-term debt 150,000 0
Change in checks issued in excess of cash balances 0 11,530
Dividends on common stock (17,760) (16,459)
Repurchases of common stock (67,086) 0
Tax withholding related to net share settlements of restricted stock awards (4,172) (5,517)
Net cash used in financing activities (67,768) (64,196)
Effect of exchange rate fluctuations on cash (1,755) 1,985
Net increase (decrease) in cash and cash equivalents 8,725 (60,738)
Cash and cash equivalents, beginning of period 61,723 107,240
Cash and cash equivalents, end of period 70,448 46,502
Supplemental disclosures of cash flow information:    
Interest paid 16,725 16,643
Income taxes paid 3,580 11,438
Supplemental schedule of non-cash investing and financing activities:    
Notes receivable issued upon sale of property and equipment 1,466 1,504
Change in fair value of interest rate swaps (1,136) (1,074)
Property and equipment acquired included in accounts payable 15,141 5,774
Property and equipment disposed included in other receivables 1,719 0
Dividends accrued but not yet paid at end of period 8,653 8,874
Contingent consideration associated with acquisitions $ 0 $ (800)