Business Acquisition - Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Jun. 30, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets acquired	$ 23,000
Finite-lived intangible assets acquired	40,100
Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 2,600
Weighted-average amortization period (years)	12 years 6 months
Patents
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 12,800
Weighted-average amortization period (years)	18 years
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 24,700
Weighted-average amortization period (years)	13 years
Minimum | Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life (years)	10 years
Minimum | Patents
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life (years)	11 years
Minimum | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life (years)	10 years
Maximum | Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life (years)	15 years
Maximum | Patents
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life (years)	24 years
Maximum | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life (years)	15 years
Octane Fitness
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 63,100	$ 63,100