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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash Flows from Operating Activities      
Net income (loss) $ (42,263) $ 30,928 $ 127,987
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:      
Depreciation and amortization 18,425 16,192 12,892
Amortization of debt discount     1,260
Non-cash equity-based compensation 13,130 14,268 12,807
Non-cash asset impairment 1,220 1,335 584
Loss on extinguishment of debt     3,349
Deferred income taxes (12,264) (340) 11,276
Gain on disposal of segment   (4,112)  
Gain on sale of lab tools (767)    
Excess tax benefits from stock option exercises   (2,119) (10,406)
Changes in contingent consideration 829    
Other, net 1,971 262 (31)
Non-cash items from discontinued operations   (706) 44,381
Changes in operating assets and liabilities:      
Accounts receivable 38,844 31,215 56,843
Inventories 2,753 53,937 (18,627)
Prepaid expenses and other current assets 842 8,524 (13,087)
Income taxes receivable (12,604) 654 (9,076)
Accounts payable 7,542 (12,106) 8,098
Accrued expenses, customer deposits, deferred revenue and other current liabilities (17,329) (34,227) (72,723)
Income taxes payable (130) 1,199 (42,204)
Transfers to restricted cash (721) (1,440)  
Other, net 1,249 10,431 2,119
Discontinued operations   (1,932)  
Net cash provided by (used in) operating activities 727 111,963 115,442
Cash Flows from Investing Activities      
Capital expenditures (9,174) (24,994) (60,364)
Payments for net assets of businesses acquired (71,488)   (28,273)
Payment for purchase of cost method investment (2,391) (10,341)  
Transfers from (to) restricted cash related to discontinued operations     75,540
Proceeds from short-term investments 499,645 244,929 707,649
Payments for purchases of short-term investments (589,099) (165,080) (588,453)
Proceeds from the sale of lab tools 4,440    
Other 11 49 195
Proceeds from sale of assets from discontinued segment   3,758  
Net cash provided by (used in) investing activities (168,056) 48,321 106,294
Cash Flows from Financing Activities      
Proceeds from stock option exercises 2,199 5,409 10,714
Contingent consideration payments (5,000)    
Restricted stock tax withholdings (2,696) (1,725) (3,173)
Excess tax benefits from stock option exercises   2,119 10,406
Purchases of treasury stock     (162,077)
Repayments of long-term debt (269) (248) (105,803)
Other     (2)
Net cash provided by (used in) financing activities (5,766) 5,555 (249,935)
Effect of exchange rate changes on cash and cash equivalents (663) 796 989
Net increase (decrease) in cash and cash equivalents (173,758) 166,635 (27,210)
Cash and cash equivalents at beginning of period 384,557 217,922 245,132
Cash and cash equivalents at end of period 210,799 384,557 217,922
Supplemental disclosure of cash flow information      
Interest paid 357 209 1,393
Income taxes paid 8,001 11,566 89,745
Non-cash investing and financing activities      
Accrual of fair value of contingent consideration 33,539    
Merger consideration adjustment $ 2,695