SEGMENT AND GEOGRAPHIC REGION INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financial information of segments
NET SALES	$ 305,734	$ 263,588	$ 268,622	$ 266,498	$ 286,453	$ 268,297	$ 265,943	$ 229,601	$ 1,104,442	$ 1,050,294	$ 862,252
OPERATING PROFIT									101,110	76,843	41,413
Operating Segments
Financial information of segments
NET SALES									1,104,442	1,050,294	862,252
INTERSEGMENT SALES									16,182	19,270	18,014
DEPRECIATION AND AMORTIZATION									21,279	20,042	16,361
CAPITAL EXPENDITURES									31,947	41,901	29,379
Office | Operating Segments
Financial information of segments
NET SALES									686,943	656,228	599,131
INTERSEGMENT SALES									1,640	2,776	1,698
DEPRECIATION AND AMORTIZATION									14,945	13,747	13,116
OPERATING PROFIT									43,143	21,964	13,982
CAPITAL EXPENDITURES									27,058	33,541	25,615
Studio | Operating Segments
Financial information of segments
NET SALES									303,838	279,167	154,083
INTERSEGMENT SALES									6,184	5,918	6,594
DEPRECIATION AND AMORTIZATION									5,565	5,313	2,085
OPERATING PROFIT									43,335	33,567	15,335
CAPITAL EXPENDITURES									4,241	8,075	3,063
Coverings | Operating Segments
Financial information of segments
NET SALES									113,661	114,899	109,038
INTERSEGMENT SALES									8,358	10,576	9,722
DEPRECIATION AND AMORTIZATION									769	982	1,160
OPERATING PROFIT									14,632	21,312	12,096
CAPITAL EXPENDITURES									$ 648	$ 285	$ 701