Equity Interest Investments (Details 1) - USD ($) $ in Thousands	Oct. 07, 2017	Dec. 31, 2016	Oct. 01, 2016
Schedule of Equity Method Investments [Line Items]
Current assets	$ 82,810	$ 75,623	$ 89,577
Total assets	158,247	150,761	165,278
Current liabilities	22,012	18,418	21,473
Total liabilities	52,125	49,048	64,638
Stiga Sports AB [Member]
Schedule of Equity Method Investments [Line Items]
Current assets	33,874	28,322	28,857
Non-current assets	10,645	9,379	9,908
Total assets	44,519	37,701	38,765
Current liabilities	11,481	4,847	5,604
Non-current liabilities	5,556	5,133	5,583
Total liabilities	17,037	9,980	11,187
Net assets	$ 27,482	$ 27,721	$ 27,578