SEGMENT INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended					9 Months Ended
	Sep. 30, 2014		Dec. 31, 2013	Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Financial information of segments
Restructuring charges	$ 0			$ 0		$ 203		$ 0
NET SALES	268,297			216,898		763,425		631,796
INTERSEGMENT SALES	4,850	[1]		4,839	[1]	14,081	[1]	13,480	[1]
OPERATING PROFIT	23,315	[2]		17,051	[2]	57,336	[2]	39,753	[2]
Office
Financial information of segments
Restructuring charges			2,700			203
NET SALES	166,788			150,545		471,971		436,095
INTERSEGMENT SALES	837	[1]		458	[1]	1,821	[1]	1,314	[1]
OPERATING PROFIT	8,351	[2],[3]		5,677	[2],[3]	15,816	[2],[3]	11,111	[2],[3]
Studio
Financial information of segments
Restructuring charges			3,000			0
NET SALES	72,236			37,701		204,271		113,370
INTERSEGMENT SALES	1,575	[1]		1,803	[1]	4,409	[1]	4,823	[1]
OPERATING PROFIT	9,003	[2]		5,291	[2]	23,958	[2]	12,707	[2]
Coverings
Financial information of segments
Restructuring charges						0
NET SALES	29,273			28,652		87,183		82,331
INTERSEGMENT SALES	2,438	[1]		2,578	[1]	7,851	[1]	7,343	[1]
OPERATING PROFIT	$ 5,961	[2]		$ 6,083	[2]	$ 17,562	[2]	$ 15,935	[2]

[1] Intersegment sales are presented on a cost plus basis which takes into consideration the effect of transfer prices between legal entities.

[2] The Company does not allocate interest expense or other (income) expense, net to the reportable segments.

[3] Office operating profit includes $0.2 million of restructuring expenses incurred during the nine months ended September 30, 2014. These restructuring expenses were incurred to better utilize the Company's manufacturing capacity.