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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Operating activities:    
Net income $ 88,186 $ 85,477
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization expense 9,541 10,385
Amortization of operating lease right of use asset 17,995 17,090
Stock-based compensation expense 7,506 6,943
Deferred income taxes 19,489 10,461
Loss on disposal of assets 19 154
Impairment of intangibles and other 937 600
Changes in operating assets and liabilities, net of acquisitions:    
Receivables (25,649) (38,186)
Prepaid expenses (4,484) (2,436)
Other assets 6,170 (4,169)
Prepaid income taxes (13,739) 3,322
Accounts payable and accrued expenses (9,148) (16,354)
Salaries, wages, and benefits payable (4,560) 3,850
Government stimulus advance 0 44,273
Contract liabilities - deferred revenue (65,026) 310,712
Other long term liabilities 0 17,818
Operating lease liabilities (17,962) (16,876)
Income taxes payable (21,042) 2,506
Net amounts due to/from governmental entities (57) 306
Net cash provided by (used in) operating activities (11,824) 435,876
Investing activities:    
Purchases of property, building and equipment (15,619) (40,944)
Proceeds from sale of property, building and equipment 150 7,142
Cash received (paid) for acquisitions (649) 3,125
Proceeds from sale of an entity 1,531 0
Minority interest investments (10,100) 0
Net cash used in investing activities (24,687) (30,677)
Financing activities:    
Proceeds from line of credit 0 256,230
Payments on line of credit (20,000) (479,230)
Government stimulus advance (93,257) 0
Proceeds from employee stock purchase plan 1,222 1,107
Noncontrolling interest distributions (13,332) (10,267)
Withholding taxes paid on stock-based compensation (10,754) (8,602)
Purchase of additional controlling interest (2,113) (23,575)
Exercise of vested awards and stock options 0 218
Sale of noncontrolling interest 284 0
Net cash used in financing activities (137,950) (264,119)
Change in cash (174,461) 141,080
Cash at beginning of period 286,569 31,672
Cash at end of period 112,108 172,752
Supplemental disclosures of cash flow information:    
Interest paid 1,322 4,083
Income taxes paid 38,103 2,375
Non-Cash Operating Activity:    
Operating right of use assets in exchange for lease obligations 25,656 18,690
Non-Cash Investing Activity:    
Accrued capital expenditures $ 1,108 $ 2,348

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