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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash Flows provided by Operating Activities:    
Net income $ 43,292 $ 34,134
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 10,362 8,645
Provision for doubtful accounts 1,428 1,116
Stock-based compensation expense 737 560
Deferred income taxes 429 164
Loss on disposal of fixed assets 51  
Changes in assets and liabilities:    
Accounts receivable 63,881 28,101
Inventories (9,399) (16,189)
Prepaid expenses, income tax receivables and other current assets 812 (2,191)
Other non-current assets 283 (3,945)
Accounts payable (29,361) (13,162)
Accrued expenses and other liabilities (1,262) (8,872)
Net cash provided by operating activities 81,253 28,361
Cash Flows used in Investing Activities:    
Purchases of equipment (15,641) (7,944)
Net cash used in investing activities (15,641) (7,944)
Cash Flows used in Financing Activities:    
Proceeds from short-term borrowings 859  
Repayment of short-term borrowings (859)  
Purchase of treasury shares (4,384)  
Dividend payment (9,123) (9,041)
Exercise of stock options   1,679
Issuance of stock under Employee Stock Purchase Plan 605 603
Payment of payroll taxes on stock-based compensation through shares withheld (457) (500)
Net cash used in financing activities (13,359) (7,259)
Increase in cash and cash equivalents 52,253 13,158
Cash and cash equivalents, beginning of period 49,990 49,180
Cash and cash equivalents, end of period 102,243 62,338
Non-cash Investing and Financing Activities:    
Accrued capital expenditures 1,055 294
Supplemental Cash Flow Information:    
Income taxes paid $ 15,134 $ 24,293