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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 $ 36,538 $ 18,409 $ 6,801
Adjustments required to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and amortization 10,978 13,149 13,140
Capital loss from disposal of property and equipment 461 275 245
Stock-based compensation of options and RSUs 2,135 1,006 856
Accrued severance pay, net 361 57 118
Exchange rate differences on long-term loans (12) (34) 186
Deferred income taxes, net (14,883) (3,672) 189
Decrease (increase) in trade receivables, net (1,323) 2,061 (2,512)
Decrease (increase) in contract assets 24,062 11,029 (17,076)
Decrease (increase) in other assets and receivables 1,511 (4,917) (9,147)
Decrease (increase) in inventories (8,076) 5,743 (10,763)
Increase (decrease) in trade payables (3,884) (8,926) 4,087
Increase (decrease) in accrued expenses (11,671) (7,206) 19,633
Increase (decrease) in advances from customers and deferred revenues 1,112 12,433 (20,858)
Decrease in advances from customers held by trustees (1,478) (6,185)
Increase (decrease) in other liabilities (2,527) (5,912) 4,063
Net cash provided by (used in) operating activities 34,782 32,017 (17,223)
Cash flows from investing activities:      
Purchase of property and equipment (7,982) (10,759) (3,692)
Net cash used in investing activities (7,982) (10,759) (3,692)
Cash flows from financing activities:      
Proceeds from exercise of stock option and RSUs 375 2,148 661
Repayment of long-term loans (4,447) (4,469) (4,673)
Dividend payment (24,864)
Net cash used in financing activities (28,936) (2,321) (4,012)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (99) (1,490) 51
Increase (decrease) in cash, cash equivalents and restricted cash (2,235) 17,447 (24,876)
Cash, cash equivalents and restricted cash at the beginning of the year 104,204 86,757 111,633
Cash, cash equivalents and restricted cash at the end of the year 101,969 104,204 86,757
Cash paid during the year for:      
Interest 509 303 906
Income taxes 1,580 3,900 2,410
Non-cash transactions:      
Purchases of property and equipment that were not paid for and reclassification from inventories to property and equipment 1,449 2,307 5,710
Reclassification from property and equipment to inventories $ 680 $ 343 $ 129