Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net loss	$ (5,005)	$ (11,606)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	7,938	5,729
Amortization of net premiums and discounts on available for sale securities	0	131
Amortization of long term debt financing costs	320	283
Amortization of debt discount	2,595	2,445
Unrealized foreign currency transaction (gain), net	(113)	(72)
Non-cash stock compensation expense	7,372	4,611
Loss on disposal of fixed assets	7	19
Deferred tax provision	1,669	(5,430)
Excess tax benefit from share-based compensation arrangements	(1,670)	(3,648)
Adjustment to contingent purchase price	2,264	(364)
Changes in operating assets and liabilities:
Accrued interest receivable	1	198
Accounts receivable	(2,768)	(4,872)
Inventory	1,120	(7,994)
Prepaid expenses and other current assets	(314)	(8,991)
Accounts payable	(19,575)	(15,148)
Accrued expenses	7,740	(2,217)
Deferred revenue	(4,087)	(1,124)
Other liabilities	(2,583)	85
Net cash used in operating activities	(5,089)	(47,965)
Cash flows from investing activities:
Proceeds from maturities and sales of available for sale securities	0	27,056
Purchases of fixed assets	(3,393)	(852)
Cash used for acquisitions, net	(63)	(301,699)
Other investments	0	(875)
Decrease in restricted cash	83	5
Net cash used in investing activities	(3,373)	(276,365)
Cash flows from financing activities:
Proceeds from issuances of common stock	8,582	29,735
Excess tax benefit from share-based compensation arrangements	1,670	3,648
Net cash provided by financing activities	10,252	33,383
Effect of exchange rate changes on cash	(141)	(108)
Increase (decrease) in cash and cash equivalents	1,649	(291,055)
Cash and cash equivalents at beginning of period	376,727	519,446
Cash and cash equivalents at end of period	378,376	228,391
Supplemental disclosure of cash flow information:
Interest paid	0	0
Taxes paid	$ 1,180	$ 1,400