Consolidated Statements Of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income (loss)		$ (663,925)	$ 11,946	$ 44,119
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:
Benefit of deferred income taxes		(2,875)	(24,555)	(9,892)
Depreciation and amortization		83,069	55,188	30,444
Provision for litigation award		11,282
Impairment of goodwill, other intangible assets and investments		544,611
Non-cash interest on convertible notes			224	974
Provision for bad debts		3,766	8,699	4,961
Provision for inventory obsolescence and revaluation		21,550	2,334	4,341
Stock-based compensation		34,733	32,793	13,558
(Gain) loss on the disposition of property and equipment		(43)	(227)	1,128
Deferred interest income				(1,018)
Loss on conversion of convertible debt			1,806	11,275
Changes in operating accounts:
Accounts receivable		20,890	(55,977)	(43,684)
Inventories		(31,241)	(33,088)	(35,234)
Prepaid expenses and other current assets		2,197	(9,235)	(1,780)
Accounts payable		(18,904)	23,482	7,620
Accrued and other liabilities		624	15,406	(6,495)
Customer deposits		1,466	1,921	1,904
Deferred revenue		(576)	8,686	7,526
Other operating assets and liabilities		(9,752)	11,708	(4,563)
Net cash provided by (used in) operating activities		(3,128)	51,111	25,184
Cash flows from investing activities:
Purchases of property and equipment		(22,399)	(22,727)	(6,972)
Additions to license and patent costs		(907)	(753)	(1,648)
Proceeds from disposition of property and equipment				1,882
Cash paid for acquisitions, net of cash assumed		(91,799)	(345,361)	(162,318)
Other investing activities		(5,750)	(6,600)	(4,701)
Net cash used in investing activities		(120,855)	(375,441)	(173,757)
Cash flows from financing activities:
Tax benefits (provision) from share-based payment arrangements		(1,243)	7,653	26,038
Proceeds from issuance of common stock			299,729	272,076
Proceeds from exercise of restricted stock, net		135	1,896	902
Cash disbursed in lieu of fractional shares related to stock split				(176)
Restricted cash				13
Repayment of capital lease obligations		(1,049)	(696)	(157)
Net cash provided by (used in) financing activities		(2,157)	308,582	298,696
Effect of exchange rate changes on cash		(3,079)	(5,706)	334
Net increase (decrease) in cash and cash equivalents		(129,219)	(21,454)	150,457
Cash and cash equivalents at the beginning of the period		284,862	306,316	155,859
Cash and cash equivalents at the end of the period		155,643	284,862	306,316
Supplemental Cash Flow Information:
Cash interest payments		707	888	1,584
Cash income tax payments		12,512	15,602	5,642
Transfer of equipment from inventory to property and equipment, net	[1]	9,902	5,891	4,886
Transfer of equipment to inventory from property and equipment, net	[2]	$ 2,764	944	612
Stock issued for acquisitions of businesses			24,625	13,131
Notes redeemed for shares of common stock			$ 12,134	$ 80,754

[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 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.