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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Operating Activities |  |
Net (loss) income | $ (4,013) | $ 87,457
Adjustments to reconcile net income to cash provided by operations: |  |
Depreciation and amortization | 55,962 | 27,854
Stock-based compensation expense | 8,526 | 5,696
Loss (gain) on disposal of property, plant and equipment | 1,028 | (24)
Changes in operating assets and liabilities, net of acquisitions |  |
Accounts receivable and unbilled accounts receivable | (51,614) | (66,347)
Inventories | 75,300 | (50,755)
Accounts payable | (116,375) | 32,096
Accrued income taxes | 18,396 | 14,004
Accrued liabilities and customer deposits | (59,978) | (1,529)
Other assets and liabilities | 104,106 | (24,252)
Net cash provided by operating activities | 31,338 | 24,200
Investing Activities |  |
Purchase of property, plant and equipment | (29,720) | (17,466)
Proceeds from disposal of property, plant and equipment | 786 | 7,898
Acquisitions of businesses, net of cash acquired | (2,710,714) | (34,297)
Net cash used for investing activities | (2,739,648) | (43,865)
Financing Activities |  |
Proceeds from debt | 1,736,521 | 306,610
Payments of debt | (837,744) | (266,347)
Proceeds from exercise of stock options and other benefit plans | 25 | 2,873
Payment of income tax withholding on share-based compensation | (4,125) | (2,937)
Cash dividends ($0.12 and $0.12 per share for the three months ended March 31, 2019 and 2018, respectively) | (11,687) | (11,531)
Net cash provided by financing activities | 882,990 | 28,668
Effect of changes in currency exchange rates | (4,164) | 7,482
(Decrease) increase in cash | (1,829,484) | 16,485
Cash, cash equivalents and restricted cash beginning of period | 2,342,354 | 233,401
Cash and cash equivalents end of period | $ 512,870 | $ 249,886

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