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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net loss $ (17,812) $ (13,148)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Benefit of deferred income taxes (1,092) (10,254)
Depreciation and amortization 15,089 19,470
Impairment of investments 899  
Provision for bad debts 2,388 2,881
Provision for inventory obsolescence and revaluation 543 756
Stock-based compensation 11,667 10,329
Loss on the disposition of property and equipment 162 253
Changes in operating accounts, net of acquisition activity:    
Accounts receivable 21,544 17,986
Inventories (8,527) (20,767)
Prepaid expenses and other current assets (434) (2,784)
Accounts payable (5,956) (5,815)
All other operating activities (353) 156
Net cash provided by (used in) operating activities 18,118 (937)
Cash flows from investing activities:    
Purchases of property and equipment (4,246) (3,693)
Additions to license and patent costs (231) (203)
Cash paid for acquisitions, net of cash assumed   (77,984)
Other investing activities   (600)
Net cash used in investing activities (4,477) (82,480)
Cash flows from financing activities:    
Tax benefits (provision) from share-based payment arrangements   447
Proceeds (repurchase) — restricted stock (810) 360
Repayment of capital lease obligations (262) (176)
Net cash provided by (used in) financing activities (1,072) 631
Effect of exchange rate changes on cash 1,562 (2,180)
Net increase (decrease) in cash and cash equivalents 14,131 (84,966)
Cash and cash equivalents at the beginning of the period 155,643 284,862
Cash and cash equivalents at the end of the period 169,774 199,896
Supplemental Cash Flow Information:    
Cash interest payments 214 143
Cash income tax payments 1,707 1,707
Transfer of equipment from inventory to property and equipment, net [1] 5,760 2,539
Transfer of equipment to inventory from property and equipment, net [2] $ 1,779 $ 1,822
[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 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.