CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net loss		$ (44,448)	$ (59,469)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Benefit of deferred income taxes		(5,464)	(21,971)
Depreciation and amortization		45,731	63,905
Provision for arbitration award			11,282
Impairment of assets		8,590	1,111
Provision for bad debts		1,488	4,123
Inventory reserve of discontinued products		10,723	0
Stock-based compensation		28,405	28,850
(Gain) loss on the disposition of property and equipment		2,052	1,182
Changes in operating accounts:
Accounts receivable		36,357	37,426
Inventories		(16,977)	(40,987)
Prepaid expenses and other current assets		(1,619)	(10,136)
Accounts payable		(9,938)	(19,657)
Accrued and other current liabilities		(8,452)	(5,348)
Customer deposits		(2,389)	566
All other operating activities		(5,819)	(1,485)
Net cash provided by (used in) operating activities		38,240	(10,608)
Cash flows from investing activities:
Purchases of property and equipment		(12,014)	(18,064)
Additions to license and patent costs		(790)	(719)
Cash paid for acquisitions, net of cash assumed			(91,799)
Other investing activities		(1,000)	(3,750)
Net cash used in investing activities		(13,804)	(114,332)
Cash flows from financing activities:
Tax benefits (provision) from share-based payment arrangements			467
Proceeds, repurchase and retirement of stock, net		(1,507)	748
Repayment of capital lease obligations		(786)	(788)
Net cash provided by (used in) financing activities		(2,293)	427
Effect of exchange rate changes on cash and cash equivalents		1,572	(2,896)
Net increase (decrease) in cash and cash equivalents		23,715	(127,409)
Cash and cash equivalents at the beginning of the period		155,643	284,862
Cash and cash equivalents at the end of the period		179,358	157,453
Supplemental cash flow information:
Cash interest payments		633	494
Cash income tax payments		8,040	11,532
Transfer of equipment from inventory to property and equipment, net	[1]	9,395	8,812
Transfer of equipment to inventory from property and equipment, net	[2]	$ 349	$ 300

[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.