SUBSEQUENT EVENTS (Details) € in Millions			12 Months Ended
	Jan. 25, 2018 USD ($)	Jan. 22, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 31, 2018 USD ($)	Jan. 22, 2018 EUR (€)
Muuto Acquisition
Subsequent Event [Line Items]
Accounting and legal fees			$ 439,000
Other			104,000
Total			$ 543,000
Subsequent Event
Subsequent Event [Line Items]
Available increase, percent of EBITDA		90.00%			90.00%
Subsequent Event | Muuto Acquisition
Subsequent Event [Line Items]
Percentage of voting interests acquired	100.00%
Aggregate purchase price	$ 300,000,000
Subsequent Event | Amended Credit Agreement
Subsequent Event [Line Items]
Borrowing capacity		$ 750,000,000
Term		5 years
Borrowing capacity available increase		$ 250,000,000
Subsequent Event | Revolving Credit Facility | Amended Credit Agreement
Subsequent Event [Line Items]
Borrowing capacity		400,000,000
Subsequent Event | Term Loan | Amended Credit Agreement
Subsequent Event [Line Items]
Debt face amount		$ 250,000,000
Quarterly payments, percent of annum		5.00%
Subsequent Event | Multicurrency Term Loan | Amended Credit Agreement
Subsequent Event [Line Items]
Debt face amount | €					€ 81.7
Subsequent Event | Federal Funds Rate | Amended Credit Agreement
Subsequent Event [Line Items]
Basis spread on variable rate (as a percent)		0.50%
Subsequent Event | Eurocurrency Rate | Amended Credit Agreement
Subsequent Event [Line Items]
Basis spread on variable rate (as a percent)		1.00%
Interest Rate Swap | Subsequent Event
Subsequent Event [Line Items]
Derivative, notional amount				$ 300,000,000
Interest Rate Swap | Subsequent Event | LIBOR
Subsequent Event [Line Items]
Derivative, fixed interest rate				2.63%