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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows provided by operating activities:    
Net income $ 17,563 $ 33,786
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 5,278 5,532
Stock-based compensation 4,152 3,212
Provision for excess and obsolete inventory 2,948 2,683
Provision for bad debt 17 (172)
Deferred income taxes 347 736
Excess tax benefits from stock-based compensation (233) (524)
Other 68 1
Changes in operating assets and liabilities:    
Trade accounts receivable (10,084) (19,030)
Inventories (844) (12,817)
Income taxes 2,316 2,034
Other current assets (3,562) (5,029)
Accrued compensation (7,086) (4,930)
Other current and non-current liabilities 7,718 2,735
Accounts payable 4,772 3,587
Other assets (189) 7,801
Net cash provided by operating activities 23,181 19,605
Cash flows provided by (used in) investing activities:    
Acquisition of businesses, net of cash acquired   (9,867)
Purchases of investments (82,135) (164,327)
Maturities of investments 76,972 38,205
Sales of investments 128,250 17,414
Purchases of property, plant and equipment (2,156) (2,504)
Other   5
Net cash provided by (used in) investing activities 120,931 (121,074)
Cash flows used in financing activities:    
Repurchase of common stock (1,545)  
Net payments related to employee stock awards (2,587) (2,105)
Dividend payments to common stockholders (9,056) (8,784)
Excess tax benefits from stock-based compensation 233 524
Net cash used in financing activities (12,955) (10,365)
Effect of exchange rate changes on cash and cash equivalents (876) (890)
Increase (decrease) in cash and cash equivalents 130,281 (112,724)
Cash and cash equivalents at beginning of period 227,574 305,437
Cash and cash equivalents at end of period $ 357,855 $ 192,713