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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities    
Net income $ 48,965 $ 38,272
Adjustments to reconcile net income to net cash provided by operating activities    
Depreciation and amortization of property and equipment 28,575 24,567
Amortization of operating lease right-of-use assets 11,597  
Amortization of intangibles 18,065 19,678
Amortization of deferred financing costs and debt discount 845 883
Provision for doubtful accounts 3,173 2,219
Write-off of debt issuance costs 2,774 1,164
Gain on sale of property and equipment (69) (551)
Noncash stock compensation 6,442 6,089
Changes in assets and liabilities, excluding effects of acquisitions    
Accounts receivable (29,144) (35,953)
Inventories (852) (6,799)
Other assets (4,845) (801)
Accounts payable 2,535 7,523
Income taxes receivable/payable 13,487 10,542
Other liabilities 4,969 2,016
Net cash provided by operating activities 106,517 68,849
Cash flows from investing activities    
Purchases of investments (17,352) (22,818)
Maturities of short term investments 22,560 37,500
Purchases of property and equipment (37,267) (27,051)
Acquisitions of businesses (24,740) (34,682)
Proceeds from sale of property and equipment 563 1,106
Other (1,795) (1,590)
Net cash used in investing activities (58,031) (47,535)
Cash flows from financing activities    
Proceeds from senior notes (Note 6) 300,000  
Proceeds from term loan (Note 6)   100,000
Payments on term loan (Note 6) (195,750) (750)
Proceeds from vehicle and equipment notes payable 23,767 20,657
Debt issuance costs (5,191) (1,992)
Principal payments on long-term debt (15,278) (10,324)
Principal payments on finance lease obligations (3,398) (4,316)
Acquisition-related obligations (5,797) (2,901)
Repurchase of common stock   (42,827)
Surrender of common stock awards by employees (2,331) (2,282)
Net cash provided by financing activities 96,022 55,265
Net change in cash and cash equivalents 144,508 76,579
Cash and cash equivalents at beginning of period 90,442 62,510
Cash and cash equivalents at end of period 234,950 139,089
Supplemental disclosures of cash flow information Net cash paid during the period for:    
Interest 17,746 14,110
Income taxes, net of refunds 3,790 1,902
Supplemental disclosure of noncash activities    
Right-of-use assets obtained in exchange for operating lease obligations 11,593  
Termination of operating lease obligations and right-of-use assets (2,814)  
Property and equipment obtained in exchange for finance lease obligations 2,175 1,034
Seller obligations in connection with acquisition of businesses 4,322 5,420
Unpaid purchases of property and equipment included in accounts payable $ 1,527 $ 615