Year ended December 31 | ||||||||||||
2013 | 2012 | 2011 | ||||||||||
Net (increase) decrease in operating working capital was composed of the following: | ||||||||||||
(Increase) decrease in accounts and notes receivable | $ | (1,101 | ) | $ | 1,153 | $ | (2,156 | ) | ||||
Increase in inventories | (237 | ) | (233 | ) | (404 | ) | ||||||
Decrease (increase) in prepaid expenses and other current assets | 834 | (471 | ) | (853 | ) | |||||||
Increase in accounts payable and accrued liabilities | 160 | 544 | 3,839 | |||||||||
(Decrease) increase in income and other taxes payable | (987 | ) | (630 | ) | 1,892 | |||||||
Net (increase) decrease in operating working capital | $ | (1,331 | ) | $ | 363 | $ | 2,318 | |||||
Net cash provided by operating activities includes the following cash payments for income taxes: | ||||||||||||
Income taxes | $ | 12,898 | $ | 17,334 | $ | 17,374 | ||||||
Net sales (purchases) of marketable securities consisted of the following gross amounts: | ||||||||||||
Marketable securities purchased | $ | (7 | ) | $ | (35 | ) | $ | (112 | ) | |||
Marketable securities sold | 10 | 32 | 38 | |||||||||
Net sales (purchases) of marketable securities | $ | 3 | $ | (3 | ) | $ | (74 | ) | ||||
Net sales (purchases) of time deposits consisted of the following gross amounts: | ||||||||||||
Time deposits purchased | $ | (2,317 | ) | $ | (717 | ) | $ | (6,439 | ) | |||
Time deposits matured | 3,017 | 3,967 | 5,335 | |||||||||
Net sales (purchases) of time deposits | $ | 700 | $ | 3,250 | $ | (1,104 | ) | |||||