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Acquisitions (Details) - USD ($)
$ / shares in Units, $ in Thousands
2 Months Ended 3 Months Ended 6 Months Ended
Apr. 18, 2018
Jun. 30, 2018
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Dec. 30, 2017
Purchase price allocation              
Goodwill   $ 396,689 $ 396,689   $ 396,689   $ 288,227
Revenues     217,106 $ 190,098 422,490 $ 369,126  
Pro forma financial information              
Revenues     218,145 202,697 436,333 396,911  
Net income     $ 18,281 $ 9,156 $ 41,221 $ 20,093  
Earnings per share, Basic     $ 0.42 $ 0.22 $ 0.96 $ 0.48  
Earnings per share, Diluted     $ 0.41 $ 0.21 $ 0.93 $ 0.47  
Z-Wave              
Acquisition              
Cash consideration $ 243,000            
Purchase price allocation              
Intangible assets 125,675            
Cash and cash equivalents 2,841            
Accounts receivable 5,311            
Inventories 15,581            
Other current assets 329            
Goodwill 108,461            
Other non-current assets 2,587            
Accounts payable (3,306)            
Other current liabilities (8,917)            
Other non-current liabilities (5,993)            
Total purchase price $ 242,569            
Discount rate applicable to the cash flows (as a percent) 15.00%            
Revenues   7,600          
Z-Wave | Selling, general and administrative              
Purchase price allocation              
Acquisition-related costs   $ 4,900          
Z-Wave | Developed technology              
Purchase price allocation              
Intangible assets $ 69,875            
Weighted-Average Amortization Period 7 years            
Z-Wave | Customer relationships              
Purchase price allocation              
Intangible assets $ 25,000            
Weighted-Average Amortization Period 4 years            
Z-Wave | Trademarks              
Purchase price allocation              
Intangible assets $ 9,900            
Weighted-Average Amortization Period 7 years            
Z-Wave | In-process research and development              
Purchase price allocation              
Intangible assets $ 20,900