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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Activities |  |  |
Net income | $ 291,703 | $ 262,290 | $ 313,404
Adjustments to reconcile net income to cash provided by operations: |  |  |
Depreciation and amortization | 109,297 | 103,248 | 69,795
Stock-based compensation expense | 25,315 | 21,287 | 20,813
Deferred income taxes | (5,299) | (67,423) | (10,228)
Loss on disposal of property, plant and equipment | 898 | 1,907 | 232
Changes in operating assets and liabilities, net of acquisitions |  |  |
Accounts receivable and unbilled accounts receivable | (54,611) | (68,676) | 19,728
Inventories | (108,883) | (8,955) | 45,340
Accounts payable | 48,763 | (91,722) | (18,932)
Accrued income taxes | 7,880 | 47,644 | (11,759)
Accrued liabilities and customer deposits | 31,744 | (18,891) | (11,338)
Other assets and liabilities | (32,136) | 8,102 | 33,475
Net cash provided by operating activities | 314,671 | 188,811 | 450,530
Investing Activities |  |  |
Purchase of property, plant and equipment | (93,305) | (89,466) | (50,216)
Proceeds from disposal of property, plant and equipment | 11,293 | 1,291 | 363
Acquisitions of business, net of cash acquired | (51,153) | (945,299) | (183,113)
Other | (14,122) | 0 | 0
Net cash used for investing activities | (147,287) | (1,033,474) | (232,966)
Financing Activities |  |  |
Proceeds from debt, net of issuance costs | 3,480,702 | 1,216,740 | 1,875,000
Payments of debt | (1,453,954) | (1,269,537) | (1,102,748)
Stock re-purchase | 0 | 0 | (212,176)
Proceeds from exercise of stock options and other benefit plans | 9,962 | 4,428 | 1,983
Payment of income tax withholding on share-based compensation | (12,322) | (6,844) | (6,658)
Cash dividends | (46,277) | (42,218) | (32,430)
Net cash provided by (used for) financing activities | 1,978,111 | (97,431) | 522,971
Effect of changes in currency exchange rates | (36,542) | 32,263 | (26,436)
Increase (decrease) in cash | 2,108,953 | (909,831) | 714,099
Cash, cash equivalents and restricted cash, beginning of year | 233,401 | 1,143,232 | 429,133
Cash, cash equivalents and restricted cash, end of year | $ 2,342,354 | $ 233,401 | $ 1,143,232

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- Definition The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Increase decrease in accrued liabilities and customer deposits. + References No definition available. + Details
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Namespace Prefix: | wab_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration