Business Acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill	$ 60,475	$ 60,470	$ 2,520
Measurement period adjustments, goodwill	(138)
Octane Fitness
Business Acquisition [Line Items]
Cash	7,759	7,759
Accounts receivable	12,507	12,507
Inventories	13,683	12,168
Prepaid expenses	884	1,028
Deferred tax assets	716	1,287
Property, plant and equipment	3,240	3,240
Intangible assets	63,100	63,100
Total assets acquired	101,889	101,089
Accounts payable	6,215	6,215
Accrued liabilities	1,614	1,614
Warranty obligations	5,550	5,550
Deferred tax liabilities, non-current	20,914	20,914
Other non-current liabilities	519	519
Total liabilities assumed	34,812	34,812
Net identifiable assets acquired	67,077	66,277
Goodwill	58,219	58,357
Net assets acquired	125,296	$ 124,634
Measurement period adjustments, inventories	1,515
Measurement period adjustments, prepaid expenses	(144)
Measurement period adjustments, deferred tax assets	(571)
Measurement period adjustments, total assets	800
Measurement period adjustments, liabilities	0
Measurement period adjustments, assets and liabilities	800
Measurement period adjustments, goodwill	(138)
Measurement period adjustments, assets, goodwill and liabilities	$ 662