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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2016 | Jun. 30, 2015
Cash flows from operating activities: |  |  |
Net loss |  | $ (23,021) | $ (26,983)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities: |  |  |
Benefit of deferred income taxes |  | (2,201) | (14,773)
Depreciation and amortization |  | 30,435 | 41,895
Impairment of investments and leasehold improvements |  | 2,760 |
Provision for bad debts |  | 2,677 | 5,135
Stock-based compensation |  | 18,893 | 20,050
(Gain) loss on the disposition of property and equipment |  | (51) | 711
Changes in operating accounts, net of acquisition activity: |  |  |
Accounts receivable |  | 30,375 | 25,899
Inventories |  | (16,153) | (34,117)
Prepaid expenses and other current assets |  | (2,463) | (13,332)
Accounts payable |  | (4,526) | (3,827)
Accrued and other current liabilities |  | (4,328) | (11,393)
All other operating activities |  | (1,357) | 4,382
Net cash provided by (used in) operating activities |  | 31,040 | (6,353)
Cash flows from investing activities: |  |  |
Purchases of property and equipment |  | (7,597) | (12,196)
Additions to license and patent costs |  | (790) | (560)
Cash paid for acquisitions, net of cash assumed |  |  | (91,799)
Other investing activities |  | (1,000) | (1,750)
Net cash used in investing activities |  | (9,387) | (106,305)
Cash flows from financing activities: |  |  |
Tax benefits (provision) from share-based payment arrangements |  |  | 547
Proceeds (repurchase) — restricted stock |  | (1,307) | 942
Repayment of capital lease obligations |  | (524) | (526)
Net cash provided by (used in) financing activities |  | (1,831) | 963
Effect of exchange rate changes on cash |  | 783 | (1,950)
Net increase (decrease) in cash and cash equivalents |  | 20,605 | (113,645)
Cash and cash equivalents at the beginning of the period |  | 155,643 | 284,862
Cash and cash equivalents at the end of the period |  | 176,248 | 171,217
Supplemental cash flow information: |  |  |
Cash interest payments |  | 211 | 283
Cash income tax payments |  | 5,933 | 8,552
Transfer of equipment from inventory to property and equipment, net | [1] | 7,529 | 4,403
Transfer of equipment to inventory from property and equipment, net | [2] | $ 2,075 | $ 3,923
[1] | Inventory is transferred from inventory to "property and equipment, net" at cost when the Company requires additional machines for training or demonstration or for placement into on demand parts manufacturing services locations.
[2] | In general, an asset is transferred from property and equipment, net, into inventory at its net book value when the Company has identified a potential sale for a used machine.

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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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- Definition The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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