CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:
Net Income (Loss) Attributable to Parent	$ 12,847	$ (18,246)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Stock-based compensation	7,754	8,522
Depreciation	6,979	7,671
Amortization of intangible assets	13,554	14,037
Non-cash interest expense and amortization of convertible debt issuance costs	11,711	8,234
Impairment of investment in non-marketable equity security	0	1,400
Deferred income taxes	5,941	875
Non-cash restructuring	0	653
Gain from sale of intellectual property	(170)	(1,388)
Change in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	(10,252)	(474)
Prepaid expenses and other assets	(1,283)	3,163
Accounts payable	756	(865)
Accrued salaries and benefits and other liabilities	(17,401)	(18,965)
Income taxes payable	(3,982)	544
Net cash provided by operating activities	26,454	5,161
Cash flows from investing activities:
Purchases of property, plant and equipment	(4,293)	(5,309)
Acquisition of intangible assets	0	(2,500)
Purchases of marketable securities	(166,070)	(60,496)
Maturities of marketable securities	51,428	64,250
Proceeds from sale of marketable securities	17,689	0
Proceeds from sale of intellectual property	2,500	2,250
Net cash used in investing activities	(98,746)	(1,805)
Cash flows from financing activities:
Proceeds received from issuance of common stock under employee stock plans	5,855	3,054
Principal payments against lease financing obligation	(132)	(62)
Payments under installment payment arrangement	(56)	(56)
Repayment of convertible senior notes	(172,500)	0
Net cash provided by (used in) financing activities	(166,833)	2,936
Net increase (decrease) in cash and cash equivalents	(239,125)	6,292
Cash and cash equivalents at beginning of period	338,696	148,984
Cash and cash equivalents at end of period	99,571	155,276
Non-cash investing and financing activities during the period:
Property, plant and equipment received and accrued in accounts payable and other liabilities	$ 166	$ 112