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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash flows from operating activities:    
Net Income (Loss) $ 5,754 $ 16,363
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 9,913 8,181
Depreciation 5,965 6,295
Amortization of intangible assets 15,871 12,645
Non-cash interest expense and amortization of convertible debt issuance costs 3,326 3,140
Excess tax benefits from stock-based compensation, Operating Activities (591) (483)
Deferred income taxes 2,816 1,233
Gain from sale of intellectual property and property, plant and equipment, net (37) (3,151)
Effect of Exchange Rate on assumed cash liability from acquisition (624) 0
Change in operating assets and liabilities:    
Accounts receivable 14,809 (744)
Prepaid expenses and other assets (1,856) (2,106)
Accounts payable 2,167 (1,873)
Accrued salaries and benefits and other liabilities (7,422) (3,803)
Income taxes payable (3,196) 282
Deferred revenue 1,794 2,418
Net cash provided by operating activities 48,689 38,397
Cash flows from investing activities:    
Purchases of property, plant and equipment (3,557) (3,117)
Purchases of marketable securities (54,869) (97,665)
Maturities of marketable securities 81,971 70,396
Proceeds from sale of marketable securities 44,546 26,648
Proceeds from sale of intellectual property and property, plant and equipment 0 3,404
Acquisition of business, net of cash acquired (80,523) 0
Net cash used in investing activities (12,432) (334)
Cash flows from financing activities:    
Excess tax benefits from stock-based compensation, Financing Activities 591 483
Proceeds received from issuance of common stock under employee stock plans 8,259 9,053
Principal payments against lease financing obligation (295) (208)
Net cash provided by financing activities 8,555 9,328
Effect of Exchange Rate on Cash and Cash Equivalents (565) (40)
Net increase in cash and cash equivalents 44,247 47,351
Cash and cash equivalents at beginning of period 143,764 154,126
Cash and cash equivalents at end of period 188,011 201,477
Non-cash investing and financing activities during the period:    
Assumed cash liability from acquisition 11,476 0
Property, plant and equipment received and accrued in accounts payable and other liabilities $ 246 $ 677