SEGMENT INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended					6 Months Ended
	Jun. 30, 2014		Dec. 31, 2013	Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Financial information of segments
Restructuring Charges	$ 203			$ 0		$ 203		$ 0
NET SALES	265,797			214,312		495,128		414,898
INTERSEGMENT SALES (1)	4,833			4,144		9,231		8,641
OPERATING PROFIT	22,195	[1]		12,408	[1]	34,021	[1]	22,702	[1]
Office
Financial information of segments
Restructuring Charges			2,700			203
NET SALES	159,100			148,070		305,183		285,550
INTERSEGMENT SALES (1)	511			214		984		856
OPERATING PROFIT	6,402	[1]		3,432	[1]	7,465	[1]	5,434	[1]
Studio
Financial information of segments
Restructuring Charges			3,000
NET SALES	76,308			37,231		132,035		75,669
INTERSEGMENT SALES (1)	1,524			1,498		2,834		3,020
OPERATING PROFIT	9,463	[1]		3,274	[1]	14,955	[1]	7,416	[1]
Coverings
Financial information of segments
NET SALES	30,389			29,011		57,910		53,679
INTERSEGMENT SALES (1)	2,798			2,432		5,413		4,765
OPERATING PROFIT	$ 6,330	[1]		$ 5,702	[1]	$ 11,601	[1]	$ 9,852	[1]

[1] 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 three months ended June 30, 2014. These restructuring expenses were incurred to better utilize the Company's manufacturing capacity.