Business Acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill	$ 60,516	$ 60,470	$ 2,520
Measurement period adjustments, goodwill	(63)
Octane Fitness
Business Acquisition [Line Items]
Cash	7,759	7,759
Accounts receivable	12,507	12,507
Inventories	13,683	12,168
Prepaid expenses	885	1,028
Deferred tax assets	760	1,287
Property, plant and equipment	3,372	3,240
Intangible assets	63,100	63,100
Total assets acquired	102,066	101,089
Accounts payable	6,497	6,215
Accrued liabilities	1,606	1,614
Warranty obligations	5,550	5,550
Deferred tax liabilities, non-current	21,012	20,914
Other non-current liabilities	390	519
Total liabilities assumed	35,055	34,812
Net identifiable assets acquired	67,011	66,277
Goodwill	58,294	58,357
Net assets acquired	125,305	$ 124,634
Measurement period adjustments, inventories	1,515
Measurement period adjustments, prepaid expenses	(143)
Measurement period adjustments, deferred tax assets	(527)
Measurement period adjustments, property, plant and equipment	132
Measurement period adjustments, total assets	977
Measurement period adjustments, acounts payable	282
Measurement period adjustments, accrued liabilities	(8)
Measurement period adjustments, deferred tax liabilities, non-current	98
Measurement period adjustments, other non-current liabilities	(129)
Measurement period adjustments, liabilities	243
Measurement period adjustments, assets and liabilities	734
Measurement period adjustments, goodwill	(63)
Measurement period adjustments, assets, goodwill and liabilities	$ 671