Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income (loss)	$ (63,398)	$ 14,161
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Non-cash impairment charge	104,245
Non-cash share-based compensation expense	12,286	10,360
Non-cash interest expense	4,890	4,557
Non-cash charge for contingent consideration	42	1,846
Non-cash charge for option amortization	2,169	1,656
Non-cash investment premium amortization	501	1,072
Deferred tax provision	(54,176)	(11,357)
Depreciation and amortization expense	18,211	19,040
Other, net	2,093	2,481
Changes in assets and liabilities:
Accounts receivable	18,230	23,635
Inventory	(24,098)	18,117
Prepaid expenses and other current assets	(3,266)	(9,272)
Prepaid income taxes and income taxes payable	9,325	(2,539)
Other assets	(1,223)	(7,484)
Accounts payable	(4,582)	(4,950)
Accrued expenses and other current liabilities	(11,831)	13,779
Other non-current liabilities	(160)	(224)
Net cash provided by operating activities	9,258	74,878
Cash flows from investing activities:
Purchase of property, equipment and building improvements	(1,189)	(585)
Purchase of short-term investments	(38,180)	(77,408)
Maturities of short-term investments	41,650	90,103
Net cash provided by investing activities	2,281	12,110
Cash flows from financing activities:
Payment for treasury shares acquired		(71,523)
Net proceeds from issuance of common stock	3,858	5,947
Excess tax benefits from share-based payment arrangements	808	4,832
Net cash provided by (used in) financing activities	4,666	(60,744)
Effect of exchange rate changes on cash	(325)	(383)
Net increase in cash and cash equivalents	15,880	25,861
Cash and cash equivalents at beginning of period	175,518	331,352
Cash and cash equivalents at end of period	$ 191,398	$ 357,213