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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash flows from operating activities: |  |  |  |
Net loss |  | $ (65,323) | $ (39,265) | $ (663,925)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities: |  |  |  |
Depreciation and amortization |  | 62,041 | 60,535 | 83,069
Stock-based compensation |  | 27,260 | 31,295 | 34,733
Lower of cost or market adjustment |  | 12,883 | 11,053 | 21,550
Impairment of assets |  | 2,427 | 8,618 | 544,611
Provision for bad debts |  | 1,051 | 1,552 | 3,766
Provision for arbitration award |  |  |  | 11,282
Provision for deferred income taxes |  | (5,567) | (6,566) | (2,875)
(Gain) loss on the disposition of property and equipment |  |  | 1,465 | (43)
Changes in operating accounts, net of acquisitions: |  |  |  |
Accounts receivable |  | 3,987 | 26,255 | 20,534
Inventories |  | (17,716) | (20,656) | (37,216)
Prepaid expenses and other current assets |  | (49,834) | (3,895) | 16,900
Accounts payable |  | 12,448 | (4,975) | (20,049)
Accrued and other current liabilities |  | 50,209 | (7,670) | (10,320)
All other operating activities |  | (7,925) | (265) | (4,848)
Net cash provided by (used in) operating activities |  | 25,941 | 57,481 | (2,831)
Cash flows from investing activities: |  |  |  |
Cash paid for acquisitions, net of cash assumed |  | (34,291) |  | (91,799)
Purchases of property and equipment |  | (30,881) | (16,567) | (22,399)
Additions to license and patent costs |  | (1,159) | (1,132) | (907)
Proceeds from disposition of property and equipment |  | 273 | 350 |
Purchase of noncontrolling interest |  | (2,250) | (3,533) |
Other investing activities |  | (2,351) | (1,000) | (5,750)
Net cash used in investing activities |  | (70,659) | (21,882) | (120,855)
Cash flows from financing activities: |  |  |  |
Payments related to net-share settlement of stock-based compensation |  | (5,545) | (2,871) | (1,108)
Payments on earnout consideration |  | (3,206) |  |
Repayment of capital lease obligations |  | (437) | (1,055) | (1,049)
Net cash used in financing activities |  | (9,188) | (3,926) | (2,157)
Effect of exchange rate changes on cash and cash equivalents |  | 5,303 | (2,369) | (3,376)
Net increase (decrease) increase in cash and cash equivalents |  | (48,603) | 29,304 | (129,219)
Cash and cash equivalents at the beginning of the period |  | 184,947 | 155,643 | 284,862
Cash and cash equivalents at the end of the period |  | 136,344 | 184,947 | 155,643
Supplemental Cash Flow Information: |  |  |  |
Cash interest payments |  | 503 | 839 | 707
Cash income tax payments, net |  | 6,339 | 11,045 | 12,512
Transfer of equipment from inventory to property and equipment, net | [1] | 9,881 | 12,493 | 9,902
Transfer of equipment to inventory from property and equipment, net | [2] | 378 | $ 1,102 | $ 2,764
Stock issued for acquisitions of businesses |  | $ 3,208 |  |
[1] | Inventory is transferred from inventory to property and equipment at cost when the Company requires additional machines for training or demonstration or for placement into on demand 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 The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=65897068&loc=SL4591552-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=64809438&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=65897068&loc=SL4591551-111686 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=64809438&loc=SL4573702-111684 + Details
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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=63488584&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=66902209&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=66902209&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=66902209&loc=d3e3602-108585 + Details
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- Definition Value of stock issued pursuant to acquisitions during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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