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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 224,915 $ 97,061 $ 89,566
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 104,808 73,270 62,795
Amortization of convertible notes debt discount 7,987 7,187 7,021
Stock-based compensation expense 22,887 15,960 15,436
Deferred income taxes (3,943) 8,091 5,593
Other 5,554 3,991 (1,661)
Change in operating assets and liabilities, net of acquisitions of businesses:      
Trade and other receivables, net (14,350) (29,190) 5,768
Inventories (232,465) (34,554) 19,682
Prepaid expenses and other assets (13,114) (2,414) (12,869)
Accounts payable, accrued liabilities and other 149,851 20,751 1,079
Net cash provided by operating activities 252,130 160,153 192,410
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures (64,804) (32,100) (27,661)
Proceeds from sale of property, equipment, facility and other 197 211 4,402
Business acquisitions, net of cash acquired (508,127) (305,995) (55,953)
Other investing activities (2,000) 0 0
Net cash used in investing activities (574,734) (337,884) (79,212)
CASH FLOWS FROM FINANCING ACTIVITIES      
Term debt borrowings 58,750 0 7,500
Term debt repayments (6,875) (5,000) (6,250)
Borrowing on revolver 832,500 239,277 653,129
Repayments on revolver (972,500) (99,277) (910,461)
Proceeds from senior notes offering 350,000 0 300,000
Proceeds from convertible notes offering 258,750 0 0
Purchase of convertible notes hedges (57,443) 0 0
Proceeds from sale of warrants 43,677 0 0
Cash dividends paid to shareholders (27,024) (23,630) (5,798)
Stock repurchases under buyback program (48,940) (23,106) (3,815)
Taxes paid for share-based payment arrangements (17,814) (3,741) (3,380)
Payment of deferred financing costs (15,745) (58) (7,219)
Payment of contingent consideration from business acquisitions (1,600) (2,000) (4,416)
Proceeds from exercise of common stock options 4,950 643 7
Net cash provided by financing activities 400,686 83,108 19,297
Increase (decrease) in cash and cash equivalents 78,082 (94,623) 132,495
Cash and cash equivalents at beginning of year 44,767 139,390 6,895
Cash and cash equivalents at end of year $ 122,849 $ 44,767 $ 139,390