RESTRUCTURING CHARGES - Summary of Changes in Restructuring Liability (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Restructuring Reserve [Roll Forward]
Balance, as of December 31, 2014			$ 1,062
Restructuring charges	$ 0	$ 203	0	$ 795
Payments			(321)
Balance, as of June 30, 2015	741		741
Office Segment
Restructuring Reserve [Roll Forward]
Balance, as of December 31, 2014			1,046
Restructuring charges		$ 200		$ 800
Payments			(305)
Balance, as of June 30, 2015	741		741
Studio Segment
Restructuring Reserve [Roll Forward]
Balance, as of December 31, 2014			0
Payments			0
Balance, as of June 30, 2015	0		0
Coverings Segment
Restructuring Reserve [Roll Forward]
Balance, as of December 31, 2014			16
Payments			(16)
Balance, as of June 30, 2015	$ 0		$ 0