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Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities:    
Net income (loss) $ (59,469) $ 10,242
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:    
Benefit of deferred income taxes (21,971) (19,113)
Depreciation and amortization 63,905 39,563
Provision for litigation award 11,282  
Impairment of investment 1,111  
Non-cash interest on convertible notes   224
Provision for bad debts 4,123 4,394
Provision for inventory obsolescence and revaluation 9,191 2,065
Stock-based compensation 28,850 23,738
Loss on the disposition of property and equipment 1,182 176
Loss on conversion of convertible debt   1,806
Changes in operating accounts:    
Accounts receivable 37,426 (40,347)
Inventories (50,178) (40,101)
Prepaid expenses and other current assets (10,136) (6,725)
Accounts payable (19,657) 11,925
Accrued and other liabilities (5,348) 8,254
Customer deposits 566 1,848
Deferred revenue (1,748) 5,813
Other operating assets and liabilities 263 24,136
Net cash provided by (used in) operating activities (10,608) 27,898
Cash flows from investing activities:    
Purchases of property and equipment (18,064) (16,783)
Additions to license and patent costs (719) (547)
Cash paid for acquisitions, net of cash assumed (91,799) (244,290)
Other investing activities (3,750) (300)
Net cash used in investing activities (114,332) (261,920)
Cash flows from financing activities:    
Tax benefits from share-based payment arrangements 467 6,870
Proceeds from issuance of common stock   299,729
Proceeds from exercise of stock options and restricted stock, net 748 1,603
Repayment of capital lease obligations (788) (317)
Net cash provided by financing activities 427 307,885
Effect of exchange rate changes on cash (2,896) (2,844)
Net increase (decrease) in cash and cash equivalents (127,409) 71,019
Cash and cash equivalents at the beginning of the period 284,862 306,316
Cash and cash equivalents at the end of the period 157,453 377,335
Supplemental Cash Flow Information:    
Cash interest payments 494 1,345
Cash income tax payments 11,532 12,654
Transfer of equipment from inventory to property and equipment, net [1] 8,812 9,530
Transfer of equipment to inventory from property and equipment, net [2] $ 5,821 4,875
Stock issued for acquisitions of businesses   24,625
Notes redeemed for shares of common stock   $ 12,540
[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.