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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Cash flows from operating activities:    
Net income $ 10,242 $ 32,866
Adjustments to reconcile net income to net cash provided by operating activities:    
Benefit of deferred income taxes (19,113) (4,274)
Depreciation and amortization 39,563 22,086
Non-cash interest on convertible notes 224 880
Provision for bad debts 4,394 3,254
Stock-based compensation 23,738 8,464
Loss on the disposition of property and equipment 176 133
Deferred interest income   (1,018)
Loss on conversion of convertible debt 1,806 11,275
Changes in operating accounts:    
Accounts receivable (40,347) (25,962)
Inventories (38,036) (21,752)
Prepaid expenses and other current assets (6,725) (4,695)
Accounts payable 11,925 6,439
Accrued and other liabilities 8,254 (75)
Customer deposits 1,848 1,256
Deferred revenue 5,813 4,282
Other operating assets and liabilities 24,136 (4,637)
Net cash provided by operating activities 27,898 28,522
Cash flows from investing activities:    
Purchases of property and equipment (16,783) (5,728)
Additions to license and patent costs (547) (1,502)
Proceeds from disposition of property and equipment   1,882
Cash paid for acquisitions, net of cash assumed (244,290) (113,069)
Other investing activities (300) (4,101)
Net cash used in investing activities (261,920) (122,518)
Cash flows from financing activities:    
Tax benefits from share-based payment arrangements 6,870 15,913
Proceeds from issuance of common stock 299,729 272,116
Proceeds from exercise of stock options and restricted stock, net 1,603 545
Cash disbursed in lieu of fractional shares related to stock split   (177)
Repayment of capital lease obligations (317) (3,680)
Net cash provided by financing activities 307,885 284,717
Effect of exchange rate changes on cash (2,844) (1,224)
Net increase in cash and cash equivalents 71,019 189,497
Cash and cash equivalents at the beginning of the period 306,316 155,859
Cash and cash equivalents at the end of the period 377,335 345,356
Supplemental Cash Flow Information:    
Interest payments 1,345 1,110
Income tax payments 12,654 3,165
Transfer of equipment from inventory to property and equipment, net 9,530 [1] 3,167 [1]
Transfer of equipment to inventory from property and equipment, net 4,875 [2] 677 [2]
Stock issued for acquisitions of businesses 24,625 7,250
Notes redeemed for shares of common stock $ 12,540 $ 78,420
[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 Quickparts’ 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.