SEGMENT INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Financial information of segments
NET SALES	$ 216,898		$ 219,794		$ 631,796		$ 637,473
INTERSEGMENT SALES	4,839		3,585		13,480		11,649
OPERATING PROFIT	17,051	[1]	23,522	[1]	39,753	[1]	59,776	[1]
Office
Financial information of segments
NET SALES	150,545		160,032		436,095		452,220
INTERSEGMENT SALES	458		277		1,314		1,447
OPERATING PROFIT	5,677	[1]	12,974	[1]	11,111	[1]	28,629	[1]
Studio
Financial information of segments
NET SALES	37,701		33,035		113,370		105,403
INTERSEGMENT SALES	1,803		1,359		4,823		3,777
OPERATING PROFIT	5,291	[1]	5,200	[1]	12,707	[1]	15,598	[1]
Coverings
Financial information of segments
NET SALES	28,652		26,727		82,331		79,850
INTERSEGMENT SALES	2,578		1,949		7,343		6,425
OPERATING PROFIT	$ 6,083	[1]	$ 5,348	[1]	$ 15,935	[1]	$ 15,549	[1]

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