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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities    
Net income $ 27,753 $ 22,709
Adjustments to reconcile net income to net cash provided by operating activities    
Depreciation and amortization of property and equipment 18,614 16,231
Amortization of operating lease right-of-use assets 7,607  
Amortization of intangibles 11,909 14,450
Amortization of deferred financing costs and debt discount 564 601
Provision for doubtful accounts 1,605 1,108
Write-off of debt issuance costs   1,114
Gain on sale of property and equipment (156) (227)
Noncash stock compensation 4,345 4,196
Changes in assets and liabilities, excluding effects of acquisitions    
Accounts receivable (17,876) (20,192)
Inventories (1,650) (3,995)
Other assets (1,495) (3,739)
Accounts payable (1,253) 304
Income taxes receivable / payable 6,347 5,187
Other liabilities (3,914) (4,622)
Net cash provided by operating activities 52,400 33,125
Cash flows from investing activities    
Purchases of investments (17,352) (17,782)
Maturities of short term investments 17,560 27,500
Purchases of property and equipment (17,778) (18,478)
Acquisitions of businesses (21,290) (18,626)
Proceeds from sale of property and equipment 452 557
Other (876) (1,540)
Net cash used in investing activities (39,284) (28,369)
Cash flows from financing activities    
Proceeds from term loan (Note 6)   100,000
Payments on term loan (Note 6) (2,000) (750)
Proceeds from vehicle and equipment notes payable 13,783 14,271
Debt issuance costs   (1,933)
Principal payments on long-term debt (9,751) (6,863)
Principal payments on finance lease obligations (2,481) (3,028)
Acquisition-related obligations (5,039) (2,295)
Repurchase of common stock   (24,640)
Surrender of common stock awards by employees (2,323) (2,282)
Net cash (used in) provided by financing activities (7,811) 72,480
Net change in cash and cash equivalents 5,305 77,236
Cash and cash equivalents at beginning of period 90,442 62,510
Cash and cash equivalents at end of period 95,747 139,746
Supplemental disclosures of cash flow information Net cash paid during the period for:    
Interest 11,793 8,349
Income taxes, net of refunds 3,595 1,906
Supplemental disclosure of noncash activities    
Right-of-use assets obtained in exchange for operating lease obligations 8,677  
Property and equipment obtained in exchange for finance lease obligations 1,830 814
Seller obligations in connection with acquisition of businesses 3,162 3,801
Unpaid purchases of property and equipment included in accounts payable $ 2,334 $ 1,027