Business Acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill	$ 60,470	$ 2,520	$ 2,740
Octane Fitness
Business Acquisition [Line Items]
Cash	7,759
Accounts receivable	12,507
Inventories	12,168
Prepaid expenses	1,028
Deferred tax assets	1,287
Property, plant and equipment	3,240
Intangible assets	63,100
Total assets acquired	101,089
Accounts payable	6,215
Accrued liabilities	1,614
Warranty obligations	5,550
Deferred tax liabilities, non-current	20,914
Other non-current liabilities	519
Total liabilities assumed	34,812
Net identifiable assets acquired	66,277
Goodwill	58,357
Net assets acquired	$ 124,634