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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities:    
Net Income (Loss) $ 10,265 $ 198,396
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 15,356 11,749
Depreciation 9,388 9,374
Amortization of intangible assets 26,045 18,914
Non-cash interest expense and amortization of convertible debt issuance costs 5,025 4,744
Excess tax benefits from stock-based compensation, Operating Activities (927) (652)
Deferred income taxes (4,157) (171,509)
Gain from sale of intellectual property and property, plant and equipment, net (29) (3,257)
Effect of Exchange Rate on assumed cash liability from acquisition (985) 0
Change in operating assets and liabilities, net of impact of acquisitions:    
Accounts receivable 333 (4,313)
Prepaid expenses and other assets (3,887) (3,736)
Accounts payable 2,302 (1,001)
Accrued salaries and benefits and other liabilities (8,277) (7,280)
Income taxes payable 1,644 593
Deferred revenue 7,532 1,674
Net cash provided by operating activities 59,628 53,696
Cash flows from investing activities:    
Purchases of property, plant and equipment (4,750) (4,749)
Purchases of marketable securities (54,869) (124,862)
Maturities of marketable securities 85,746 81,396
Proceeds from sale of marketable securities 50,546 43,134
Proceeds from sale of intellectual property and property, plant and equipment 0 3,510
Acquisitions of businesses, net of cash acquired (202,523) 0
Net cash used in investing activities (125,850) (1,571)
Cash flows from financing activities:    
Excess tax benefits from stock-based compensation, Financing Activities 927 652
Proceeds received from issuance of common stock under employee stock plans 12,277 10,081
Principal payments against lease financing obligation (476) (341)
Net cash provided by financing activities 12,728 10,392
Effect of Exchange Rate on Cash and Cash Equivalents (791) (90)
Net increase in cash and cash equivalents (54,285) 62,427
Cash and cash equivalents at beginning of period 143,764 154,126
Cash and cash equivalents at end of period 89,479 216,553
Non-cash investing and financing activities during the period:    
Assumed cash liability from acquisition 10,779 0
Property, plant and equipment received and accrued in accounts payable and other liabilities $ 1,344 $ 542