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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.