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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net income $ 17,914 $ 16,708 $ 17,076
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 13,611 11,608 9,885
Stock-based compensation 78 152 234
Amortization of marketable securities premium and accretion of discount 218 257 249
Loss (gains) reclassified into earnings from marketable securities (94) 16
Increase in trade receivables, net (15,752) (2,571) (8,756)
Increase in other long term and short term accounts receivable and prepaid expenses (1,773) (56) (1,669)
Increase in trade payables 3,604 1,426 1,866
Change in value of loans 3,200
Increase (decrease) in accrued expenses and other accounts payable 4,435 1,553 (196)
Increase (decrease) in deferred revenues 1,175 (180) 684
Change in deferred taxes, net (1,108) (958) 245
Net cash provided by operating activities 25,508 27,955 19,618
Cash flows from investing activities:      
Capitalized software development costs (3,771) (4,224) (3,847)
Purchase of property and equipment (1,400) (799) (1,109)
Cash paid in conjunction with acquisitions, net of acquired cash (6,890) (31,436) (9,182)
Proceeds from maturity and sale of marketable securities 4,225 2,643
Proceeds from short-term bank deposits 8,467 2,654
Investment in marketable securities and short-term bank deposits (5,766) (9,401) (5,153)
Short term loan to a related-party 1,183 (1,183)
Change in loans to employees and other deposits, net (49) 5
Net cash used in investing activities (12,419) (35,982) (16,632)
Cash flows from financing activities:      
Proceeds from exercise of options by employees 586 41 419
Dividend paid (9,359) (7,761) (7,788)
Dividend paid to non-controlling interests (571) (456) (392)
Dividend paid to redeemable non-controlling interests (5,312) (1,574)
Short-term credit, net 936 (2,840)
Purchase of non-controlling interest (352) (1,300)
Long term loan received 8,535 31,356
Repayment of long-term loans (8,190) (34)
Net cash provided by (used in) financing activities (14,312) 22,190 (11,935)
Effect of exchange rate changes on cash and cash equivalents 1,985 (1,037) (1,378)
Increase (decrease) in cash and cash equivalents 762 13,126 (10,327)
Cash and cash equivalents at the beginning of the year 75,314 62,188 72,515
Cash and cash equivalents at end of the year 76,076 75,314 62,188
Non-cash activities:      
Deferred acquisition payment 652 2,035 355
Contingent acquisition consideration 4,771 1,048
Dividend declared and not yet paid 195
Dividend in Redeemable Non-controlling interest 692 1,579 2,294
Dividend in Non-controlling interest 355
Cash paid during the year for:      
Income taxes 5,373 4,510 2,386
Interest $ 572 $ 358 $ 113