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CONSOLIDATED STATEMENTS OF CASH FLOW (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
OPERATING ACTIVITIES |  |  |  |
Net income | $ 34,259 | $ 29,843 | $ 63,667 | $ 37,742
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Depreciation | 15,345 | 17,114 | 30,987 | 35,416
Amortization | 2,409 | 2,559 | 4,723 | 5,205
Change in deferred taxes and other liabilities | 319 | (6,183) | (746) | (8,211)
Provision for write-off of property, plant and equipment | 720 | 853 | 1,106 | 1,124
Non-cash interest expense | 152 | 154 | 303 | 154
Compensation and benefits paid or payable in Class A Common Stock | 1,170 | 1,047 | 623 | 1,336
Fair value adjustment on foreign currency option |  | 34 |  | 71
Changes in operating assets and liabilities that provided cash: |  |  |  |
Accounts receivable | 14,434 | (12,052) | 2,810 | (37,141)
Contract assets | 3,528 | (13,877) | 3,047 | (11,761)
Inventories | (1,505) | (1,687) | (18,167) | (13,440)
Prepaid expenses and other current assets | (1,384) | (1,157) | (4,188) | (5,220)
Income taxes prepaid and receivable | (316) | (5) | 358 | 97
Accounts payable | (14,276) | 11,420 | 7,474 | 8,882
Accrued liabilities | (1,074) | 5,846 | (12,169) | 4,619
Income taxes payable | 5,724 | 10,020 | 7,230 | 6,589
Noncurrent receivables | (46) | (1,643) | (340) | (4,170)
Other noncurrent liabilities | (481) | (854) | (2,160) | (1,231)
Other, net | (448) | (5,745) | (1,462) | (3,321)
Net cash provided by operating activities | 58,530 | 35,687 | 83,096 | 16,740
INVESTING ACTIVITIES |  |  |  |
Purchases of property, plant and equipment | (14,606) | (23,352) | (35,404) | (39,123)
Purchased software | (27) | (23) | (49) | (52)
Net cash used in investing activities | (14,633) | (23,375) | (35,453) | (39,175)
FINANCING ACTIVITIES |  |  |  |
Proceeds from borrowings |  | 10,020 | 20,000 | 23,031
Principal payments on debt | (9,004) | (5,653) | (37,008) | (14,143)
Principal payments on finance lease liabilities | (178) |  | (578) |
Taxes paid in lieu of share issuance |  |  | (971) | (1,652)
Proceeds from options exercised | 28 | 3 | 72 | 150
Dividends paid | (5,813) | (5,482) | (11,621) | (10,956)
Net cash used in financing activities | (14,967) | (1,112) | (30,106) | (3,570)
Effect of exchange rate changes on cash and cash equivalents | (1,082) | (7,882) | (59) | (2,978)
Increase/(decrease) in cash and cash equivalents | 27,848 | 3,318 | 17,478 | (28,983)
Cash and cash equivalents at beginning of period | 187,385 | 151,426 | 197,755 | 183,727
Cash and cash equivalents at end of period | $ 215,233 | $ 154,744 | $ 215,233 | $ 154,744

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