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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Cash flows from operating activities:          
Net income $ 112,457 $ 116,885 $ 254,334 $ 209,774  
Adjustments to reconcile net income to net cash provided by operating activities:          
Depreciation 95,366 71,397 262,132 182,173  
Amortization of intangible assets 23,352 11,200 54,522 28,384  
Non-cash interest expense, net     2,342 2,201  
Non-cash stock-based compensation expense     17,673 15,538  
Provision for deferred income taxes     439 7,947  
Equity in earnings of unconsolidated affiliates (8,714) (7,445) (23,585) (22,092)  
Gains on sales of assets, net     (10,704) (12,874)  
Other non-cash items, net     (8,218) 23,046  
Changes in assets and liabilities, net of acquisitions:          
Accounts receivable     (59,665) (49,802)  
Contract assets     (109,399) 10,637  
Inventories     11,968 15,645  
Other assets, current and long-term portion     (8,998) 38,729  
Accounts payable and accrued expenses     134,487 109,689  
Contract liabilities     (7,478) 160,648  
Other liabilities, current and long-term portion     (10,753) (36,467)  
Net cash provided by operating activities     499,097 683,176  
Cash flows from investing activities:          
Cash paid for acquisitions, net of cash acquired     (604,907) (11,251)  
Capital expenditures     (132,348) (183,725)  
Proceeds from sale of property and equipment     25,465 29,744  
Payments for other investments     (7,111) (17,436)  
Proceeds from other investments     557 648  
Other investing activities, net     1,650 4,843  
Net cash used in investing activities     (716,694) (177,177)  
Cash flows from financing activities:          
Proceeds from credit facilities     795,414 1,415,426  
Repayments of credit facilities     (606,575) (1,725,845)  
Proceeds from issuance of 4.50% senior notes     0 600,000  
Repayments of 4.875% senior notes     0 (400,000)  
Payments of finance lease obligations     (117,437) (92,260)  
Payments of acquisition-related contingent consideration     (21,675) (10,097)  
Payments to non-controlling interests, including acquisition of interests and distributions     (8,965) (719)  
Proceeds from stock-based awards     0 5,483  
Payments for stock-based awards     (3,795) (614)  
Repurchases of common stock     0 (120,228)  
Other financing activities, net     (2,503) (11,128)  
Net cash provided by (used in) financing activities     34,464 (339,982)  
Effect of currency translation on cash     (61) 730  
Net (decrease) increase in cash and cash equivalents     (183,194) 166,747  
Cash and cash equivalents - beginning of period     423,118 71,427 $ 71,427
Cash and cash equivalents - end of period $ 239,924 $ 238,174 239,924 238,174 $ 423,118
Supplemental cash flow information:          
Interest paid     49,133 57,098  
Income tax payments, net of refunds     62,720 12,091  
Supplemental disclosure of non-cash information:          
Additions to property and equipment from finance leases     $ 128,337 $ 86,083