Annual report pursuant to Section 13 and 15(d)

Goodwill - Summary of Changes in Carrying Amount of Goodwill (Details)

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Goodwill - Summary of Changes in Carrying Amount of Goodwill (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 29, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jul. 01, 2017
Apr. 01, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Goodwill                          
Balance at Beginning of the Year       $ 125,645,000       $ 115,207,000 $ 125,645,000 $ 115,207,000      
Acquisition                 (241,000) 25,740,000      
Impairment Charge $ 0 $ 0 $ 0 0 $ (16,237,000) $ 0 $ 0 0 0 (16,237,000) $ 0    
Foreign Currency Translations and Other                 (452,000) 935,000      
Balance at End of the Year 124,952,000       125,645,000       124,952,000 125,645,000 115,207,000    
Goodwill, Gross                       $ 157,731,000 $ 158,424,000
Accumulated Impairment Losses                       (32,779,000) (32,779,000)
Goodwill $ 124,952,000     $ 125,645,000 $ 125,645,000     $ 115,207,000 $ 125,645,000 $ 125,645,000 $ 115,207,000 $ 124,952,000 $ 125,645,000