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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash Flows provided by Operating Activities:    
Net income $ 10,184 $ 14,896
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 3,165 3,147
Provision for credit losses (70) 2,833
Stock-based compensation expense 1,066 624
Changes in assets and liabilities:    
Accounts receivable 54,895 61,477
Inventories 333 (12,319)
Prepaid expenses, income tax receivables and other current assets (3,927) (3,300)
Other non-current assets (356) (98)
Accounts payable (60,862) (15,499)
Accrued expenses and other liabilities 1,534 (7,205)
Net cash provided by operating activities 5,962 44,556
Cash Flows used in Investing Activities:    
Purchases of equipment and capitalized software (2,403) (4,595)
Proceeds from life insurance 1,500  
Net cash used in investing activities (903) (4,595)
Cash Flows (used in) provided by Financing Activities:    
Purchase of treasury shares   (10,222)
Dividend payments (8,375) (8,427)
Payments of payroll taxes on stock-based compensation through shares withheld (82) (49)
Net cash used in financing activities (8,457) (18,698)
Increase (decrease) in cash and cash equivalents (3,398) 21,263
Cash and cash equivalents, beginning of period 95,655 90,060
Cash and cash equivalents, end of period 92,257 111,323
Non-cash Investing and Financing Activities:    
Accrued capital expenditures 714 1,237
Supplemental Cash Flow Information:    
Income taxes paid $ 261 $ 369