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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities:    
Net income $ 4,910 $ 5,883
Adjustments to reconcile net income to net cash provided by operating activities:    
Benefit of deferred income taxes (7,610) (3,543)
Depreciation and amortization 12,486 5,992
Non-cash interest on convertible notes 95 467
Provision for bad debts 1,341 601
Stock-based compensation 7,276 2,221
Gain on the disposition of property and equipment 286 63
Loss on conversion of convertible debt   5,715
Changes in operating accounts:    
Accounts receivable (11,402) (8,785)
Inventories (13,034) (3,320)
Prepaid expenses and other current assets (7,375) (440)
Accounts payable 4,267 (755)
Accrued and other liabilities 8,273 1,119
Customer deposits 976 1,284
Deferred revenue (396) 1,798
Other operating assets and liabilities 215 (1,853)
Net cash provided by operating activities 308 6,447
Cash flows from investing activities:    
Purchases of property and equipment (3,551) (2,295)
Additions to license and patent costs (210) (177)
Proceeds from disposition of property and equipment   4
Cash paid for acquisitions, net of cash assumed (2,000) (52,949)
Other investing activities (100)  
Net cash used in investing activities (5,861) (55,417)
Cash flows from financing activities:    
Tax benefits from share-based payment arrangements 5,448 4,299
Proceeds from exercise of stock options and restricted stock, net 484 302
Cash disbursed in lieu of fractional shares related to stock split   (177)
Repayment of capital lease obligations (44) (38)
Net cash provided by financing activities 5,888 4,386
Effect of exchange rate changes on cash 53 (732)
Net increase in cash and cash equivalents 388 (45,316)
Cash and cash equivalents at the beginning of the period 306,316 155,859
Cash and cash equivalents at the end of the period 306,704 110,543
Supplemental Cash Flow Information:    
Interest payments 132 133
Income tax payments 2,407 739
Transfer of equipment from inventory to property and equipment, net 2,300 [1] 915 [1]
Transfer of equipment to inventory from property and equipment, net 16 [2]  
Stock issued for acquisitions of businesses 2,000 2,979
Notes redeemed for shares of common stock $ 0 $ 42,060
[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.