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Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net income (loss) $ (26,983) $ 7,102
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:    
Benefit of deferred income taxes (14,773) (13,249)
Depreciation and amortization 41,895 24,390
Non-cash interest on convertible notes   193
Provision for bad debts 5,135 3,141
Provision for obsolete inventory 3,657 2,712
Stock-based compensation 20,050 15,638
Loss on the disposition of property and equipment 711 296
Changes in operating accounts:    
Accounts receivable 25,899 (7,013)
Inventories (37,774) (18,423)
Prepaid expenses and other current assets (13,332) (6,630)
Accounts payable (3,827) 12,983
Accrued liabilities (11,393) (3,029)
Customer deposits 678 1,818
Deferred revenue 2,411 1,544
Other operating assets and liabilities 1,293 (2,143)
Net cash provided by (used in) operating activities (6,353) 19,330
Cash flows from investing activities:    
Purchases of property and equipment (12,196) (8,965)
Additions to license and patent costs (560) (382)
Cash paid for acquisitions, net of cash assumed (91,799) (53,526)
Other investing activities (1,750) (300)
Net cash used in investing activities (106,305) (63,173)
Cash flows from financing activities:    
Tax benefits from share-based payment arrangements 547 6,368
Proceeds from issuance of common stock   299,749
Proceeds from acceptance of restricted stock, net 942 1,437
Repayment of capital lease obligations (526) (88)
Net cash provided by financing activities 963 307,466
Effect of exchange rate changes on cash (1,950) 323
Net increase (decrease) in cash and cash equivalents (113,645) 263,946
Cash and cash equivalents at the beginning of the period 284,862 306,316
Cash and cash equivalents at the end of the period 171,217 570,262
Supplemental Cash Flow Information:    
Cash interest payments 283 608
Cash income tax payments 8,552 9,594
Transfer of equipment from inventory to property and equipment, net [1] 4,403 5,454
Transfer of equipment to inventory from property and equipment, net [2] $ 3,923 3,447
Stock issued for acquisitions of businesses   $ 20,250
[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.