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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities:    
Net income $ 7,102 $ 15,226
Adjustments to reconcile net income to net cash provided by operating activities:    
Benefit of deferred income taxes (13,249) (4,481)
Depreciation and amortization 24,390 13,328
Non-cash interest on convertible notes 193 753
Provision for bad debts 3,141 601
Stock-based compensation 15,638 5,346
Loss on the disposition of property and equipment 296 3
Deferred interest income   (1,018)
Loss on conversion of convertible debt   9,253
Changes in operating accounts:    
Accounts receivable (7,013) (26,801)
Inventories (15,711) (9,900)
Prepaid expenses and other current assets (6,630) (258)
Accounts payable 12,983 253
Accrued and other liabilities (3,029) (2,744)
Customer deposits 1,818 2,055
Deferred revenue 1,544 4,069
Other operating assets and liabilities (2,143) (2,290)
Net cash provided by operating activities 19,330 3,395
Cash flows from investing activities:    
Purchases of property and equipment (8,965) (3,751)
Additions to license and patent costs (382) (1,313)
Proceeds from disposition of property and equipment   1,882
Cash paid for acquisitions, net of cash assumed (53,526) (86,199)
Other investing activities (300) (1,500)
Net cash used in investing activities (63,173) (90,881)
Cash flows from financing activities:    
Tax benefits from share-based payment arrangements 6,368 9,398
Proceeds from issuance of common stock 299,749 272,081
Proceeds from exercise of stock options and restricted stock, net 1,437 435
Cash disbursed in lieu of fractional shares related to stock split   (177)
Repayment of capital lease obligations (88) (95)
Net cash provided by financing activities 307,466 281,642
Effect of exchange rate changes on cash 323 (760)
Net increase in cash and cash equivalents 263,946 193,396
Cash and cash equivalents at the beginning of the period 306,316 155,859
Cash and cash equivalents at the end of the period 570,262 349,255
Supplemental Cash Flow Information:    
Interest payments 608 979
Income tax payments 9,594 1,601
Transfer of equipment from inventory to property and equipment, net 5,454 [1] 1,946 [1]
Transfer of equipment to inventory from property and equipment, net 3,447 [2] 441 [2]
Stock issued for acquisitions of businesses 20,250 6,750
Stock issued for conversions of 5.50% senior convertible notes   4,433
Notes redeemed for shares of common stock $ 0 $ 63,420
[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.