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 (loss) income	$ (10,179)	$ 6,428
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	17,026	12,815
Intangible asset impairment charges	15,100	0
Amortization of net premiums and discounts on available for sale securities	0	203
Amortization of long term debt financing costs	646	572
Amortization of debt discount	5,216	4,915
Unrealized foreign currency transaction (gain) loss, net	(528)	49
Non-cash stock compensation expense	16,323	10,460
Loss on disposal of fixed assets	12	26
Deferred tax provision	(532)	(2,631)
Excess tax benefit from share-based compensation arrangements	(1,667)	(5,682)
Adjustment to contingent purchase price	19,617	(5,648)
Changes in operating assets and liabilities:
Accrued interest receivable		273
Accounts receivable	(18,415)	(4,729)
Inventory	1,086	(10,482)
Prepaid expenses and other current assets	(411)	(739)
Accounts payable	(19,448)	(20,185)
Accrued expenses	28,310	6,668
Deferred revenue	(2,696)	(29)
Other liabilities	(4,917)	133
Net cash provided (used in) by operating activities	44,543	(7,583)
Cash flows from investing activities:
Proceeds from maturities and sales of available for sale securities	0	42,556
Purchases of fixed assets	(5,431)	(3,159)
Cash used for acquisitions, net	(58,871)	(301,700)
Acquisition of intangible assets	0	(10,000)
Other investments	(625)	(875)
Decrease in restricted cash	75	7
Net cash used in investing activities	(64,852)	(273,171)
Cash flows from financing activities:
Proceeds from issuances of common stock	9,506	49,561
Excess tax benefit from share-based compensation arrangements	1,667	5,682
Net cash provided by financing activities	11,173	55,243
Effect of exchange rate changes on cash	679	(1,044)
Decrease in cash and cash equivalents	(8,457)	(226,555)
Cash and cash equivalents at beginning of period	376,727	519,446
Cash and cash equivalents at end of period	368,270	292,891
Supplemental disclosure of cash flow information:
Interest paid	1,890	1,891
Taxes paid	$ 1,200	$ 1,100