SEGMENT AND GEOGRAPHIC REGION INFORMATION (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net sales by product category
Net sales	$ 230,872	$ 216,898	$ 214,312	$ 200,586	$ 250,026	$ 219,794	$ 221,018	$ 196,662	$ 862,668	$ 887,499	$ 922,200
Office Systems
Net sales by product category
Net sales									392,700	424,405	440,395
Seating
Net sales by product category
Net sales									109,650	102,523	112,098
Files and Storage
Net sales by product category
Net sales									68,185	77,695	85,404
Studio
Net sales by product category
Net sales									154,499	147,550	152,724
Coverings
Net sales by product category
Net sales									109,038	106,628	105,344
Other
Net sales by product category
Net sales									$ 28,596	$ 28,698	$ 26,235