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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash flows provided by operating activities:    
Net income $ 26,773 $ 67,006
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 21,708 11,082
Amortization of inventory step-up adjustment to fair value 10,119  
Stock-based compensation 14,668 6,778
Provision for excess and obsolete inventory 6,737 6,335
Provision for bad debt 85 (105)
Deferred income taxes 1,381 342
Excess tax benefits from stock-based compensation (452) (869)
Other 72 203
Changes in operating assets and liabilities:    
Trade accounts receivable (35,874) (18,787)
Inventories 3,868 (18,471)
Income taxes 6,420 6,404
Other current assets (4,908) (5,964)
Accrued compensation 391 (2,439)
Other current and non-current liabilities (993) 6,862
Accounts payable 7,457 (26)
Other assets (8,090) (155)
Net cash provided by operating activities 49,362 58,196
Cash flows used in investing activities:    
Acquisition of businesses, net of cash acquired (939,591) (9,910)
Purchases of investments (99,261) (264,581)
Maturities of investments 114,256 88,857
Sales of investments 336,276 28,229
Purchases of property, plant and equipment (7,264) (5,334)
Net cash used in investing activities (595,584) (162,739)
Cash flows provided by (used in) financing activities:    
Restricted cash (5,559)  
Proceeds from short-term borrowings 10,597 2,020
Payments of short-term borrowings (2,239) (2,020)
Net proceeds from long-term borrowings 746,321  
Payments of long-term borrowings (50,000)  
Repurchase of common stock (1,545) (4,341)
Net payments related to employee stock awards (2,921) (1,124)
Dividend payments to common stockholders (18,141) (17,868)
Excess tax benefits from stock-based compensation 452 869
Net cash provided by (used in) financing activities 676,965 (22,464)
Effect of exchange rate changes on cash and cash equivalents (4,042) (111)
Increase (decrease) in cash and cash equivalents 126,701 (127,118)
Cash and cash equivalents at beginning of period 227,574 305,437
Cash and cash equivalents at end of period $ 354,275 $ 178,319