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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities:      
Net income $ 25,598 $ 24,776 $ 17,914
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 14,025 12,564 13,611
Stock-based compensation 74 194 78
Change in deferred taxes, net (1,893) 526 (1,108)
Amortization of marketable securities premium and accretion of discount 117 189 218
Gains reclassified into earnings from marketable securities (94)
Net change in operating assets and liabilities:      
Trade receivables, net 6,550 (11,367) (15,752)
Other long-term and short-term accounts receivable and prepaid expenses 9,594 (4,364) (1,773)
Trade payables (5,273) 2,203 3,604
Exchange rate of loans 1,895 (2,099) 3,200
Accrued expenses and other accounts payable (7,673) 1,802 4,435
Deferred revenues 2,934 (374) 1,175
Net cash provided by operating activities 45,948 24,050 25,508
Cash flows from investing activities:      
Capitalized software development costs (4,143) (3,666) (3,771)
Purchase of property and equipment (1,379) (863) (1,400)
Cash paid in conjunction with acquisitions, net of acquired cash (22,603) (1,218) (1,787)
Proceeds from maturity and sale of marketable securities 3,356 4,000 4,225
Investment in marketable securities (5,766)
Investment in long-term bank deposits (714) (932)
Proceeds from (Investment in) short-term bank deposits 10,043 (16,875)
Short term loan to a related-party 1,183
Net cash used in investing activities (15,440) (19,554) (7,316)
Cash flows from financing activities:      
Proceeds from exercise of options by employees 69 311 586
Issuance of ordinary shares, net 104 34,569
Dividend paid (14,963) (13,543) (9,359)
Dividend paid to non-controlling interests (457) (69) (571)
Dividend paid to redeemable non-controlling interests (3,395) (2,671) (5,312)
Short-term credit, net (437)
Purchase of redeemable non-controlling interest (5,592)
Payments of contingent consideration (3,126) (5,103)
Short-term and long-term loans received 878 26 8,535
Repayment of short-term and long-term loans (13,624) (6,634) (8,190)
Net cash provided by (used in) financing activities (36,980) 8,426 (19,414)
Effect of exchange rate changes on cash and cash equivalents 1,261 (1,872) 1,984
Increase (decrease) in cash and cash equivalents (5,211) 11,050 762
Cash and cash equivalents at the beginning of the year 87,126 76,076 75,314
Cash and cash equivalents at end of the year 81,915 87,126 76,076
Non-cash activities:      
Deferred acquisition payment 11,209 652
Contingent acquisition consideration 5,851
Operating lease, right of use assets 5,949
Dividend declared and not yet paid 195
Dividend declared and not yet paid to redeemable non-controlling interests 692
Cash paid (received), net during the year for:      
Income taxes 6,736 5,419 5,373
Interest $ (152) $ 312 $ 572