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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 $ 52,469 $ 13,081
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 8,965 8,470
Stock-based compensation 5,998 8,809
Provision for excess and obsolete inventory 5,532 7,372
Provision for bad debt 329 1,017
Deferred income taxes 1,396 2,845
Excess tax benefits from stock-based compensation (348) (814)
Other 24 (16)
Changes in operating assets and liabilities:    
Trade accounts receivable 15,842 (16,345)
Inventories (11,804) (10,934)
Income taxes (17,209) (3,645)
Other current assets (3,749) (8,639)
Accrued compensation (19,662) (44)
Other current and non-current liabilities 4,518 (2,997)
Accounts payable (13,538) 7,681
Other assets (949) (195)
Net cash provided by operating activities 27,814 5,646
Cash flows from investing activities:    
Acquisition of businesses, net of cash acquired (86,950) (2,058)
Purchases of investments (231,293) (226,377)
Maturities of investments 154,505 156,306
Sales of investments 154,992 47,243
Purchases of property, plant and equipment (7,255) (6,360)
Other 135 (59)
Net cash used in investing activities (15,866) (31,305)
Cash flows from financing activities:    
Proceeds from short-term borrowings   6
Payments on short-term borrowings   (776)
Repurchase of common stock (20,809) (2,875)
Net payments related to employee stock awards (11) (2,426)
Dividend payments to common stockholders (17,326) (16,951)
Excess tax benefits from stock-based compensation 348 814
Net cash used in financing activities (37,798) (22,208)
Effect of exchange rate changes on cash and cash equivalents (263) (3,997)
Decrease in cash and cash equivalents (26,113) (51,864)
Cash and cash equivalents at beginning of period 288,902 287,588
Cash and cash equivalents at end of period $ 262,789 $ 235,724