RESTRUCTURING CHARGES - Summary of Changes in Restructuring Liability (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2013	$ 5,696
Payments	(2,562)
Balance as of March 31, 2014	3,134
Office Segment [Member]
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2013	2,721
Payments	(1,146)
Balance as of March 31, 2014	1,575
Studio Segment [Member]
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2013	2,975
Payments	(1,416)
Balance as of March 31, 2014	1,559
Coverings Segment [Member]
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2013	0
Payments	0
Balance as of March 31, 2014	$ 0