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CONSOLIDATED STATEMENTS OF CASH FLOW (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
OPERATING ACTIVITIES |  |  |  |
Net income | $ 30,306 | $ 1,233 | $ 40,788 | $ 12,207
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Depreciation | 17,114 | 15,201 | 35,416 | 29,845
Amortization | 2,559 | 2,632 | 5,205 | 5,281
Change in other noncurrent liabilities | (854) | (758) | (1,231) | (2,354)
Change in deferred taxes and other liabilities | (6,118) | (6,745) | (6,902) | (7,357)
Provision for write-off of property, plant and equipment | 853 | 534 | 1,124 | 830
Non-cash interest expense | 154 | 212 | 154 | 423
Compensation and benefits paid or payable in Class A Common Stock | 1,047 | 681 | 1,336 | 1,670
Fair value adjustment on foreign currency option | 34 | 75 | 71 | 129
Changes in operating assets and liabilities that (used)/provided cash: |  |  |  |
Accounts receivable | (12,903) | (14,395) | (44,370) | (15,136)
Contract assets | (13,877) |  | (11,761) |
Inventories | (1,371) | 1,655 | (10,615) | (13,266)
Prepaid expenses and other current assets | (1,157) | (780) | (5,220) | (2,697)
Income taxes prepaid and receivable | (5) | (2,817) | 97 | (2,817)
Accounts payable | 11,420 | (1,459) | 8,882 | 2,065
Accrued liabilities | 5,853 | 10,071 | 4,668 | (900)
Income taxes payable | 10,020 | 1,978 | 6,589 | (508)
Noncurrent receivables | (1,643) | (3,621) | (4,170) | (7,536)
Other, net | (5,745) | 4,692 | (3,321) | 3,938
Net cash provided by operating activities | 35,687 | 8,389 | 16,740 | 3,817
INVESTING ACTIVITIES |  |  |  |
Purchases of property, plant and equipment | (23,352) | (21,360) | (39,123) | (46,405)
Purchased software | (23) | (353) | (52) | (391)
Net cash used in investing activities | (23,375) | (21,713) | (39,175) | (46,796)
FINANCING ACTIVITIES |  |  |  |
Proceeds from borrowings | 10,020 | 16,114 | 23,031 | 32,259
Principal payments on debt | (5,653) | (540) | (14,143) | (21,142)
Taxes paid in lieu of share issuance |  |  | (1,652) | (1,364)
Proceeds from options exercised | 3 | 100 | 150 | 175
Dividends paid | (5,482) | (5,467) | (10,956) | (10,926)
Net cash (used in)/provided by financing activities | (1,112) | 10,207 | (3,570) | (998)
Effect of exchange rate changes on cash and cash equivalents | (7,882) | (1,424) | (2,978) | 1,027
(Decrease)/increase in cash and cash equivalents | 3,318 | (4,541) | (28,983) | (42,950)
Cash and cash equivalents at beginning of period | 151,426 | 143,333 | 183,727 | 181,742
Cash and cash equivalents at end of period | $ 154,744 | $ 138,792 | $ 154,744 | $ 138,792

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