PROPERTY, PLANT AND EQUIPMENT, NET (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, plant and equipment
Total property, plant and equipment	$ 427,590,000	$ 388,244,000
Less: accumulated depreciation	(220,836,000)	(188,757,000)
Net property, plant and equipment	206,754,000	199,487,000
Depreciation expense	42,800,000	40,700,000	38,800,000
Land, buildings and improvements
Property, plant and equipment
Total property, plant and equipment	66,851,000	66,119,000
Machinery and equipment
Property, plant and equipment
Total property, plant and equipment	115,681,000	107,664,000
Leasehold improvements
Property, plant and equipment
Total property, plant and equipment	115,815,000	102,902,000
Furniture and fixtures
Property, plant and equipment
Total property, plant and equipment	91,113,000	79,747,000
Software
Property, plant and equipment
Total property, plant and equipment	34,166,000	29,956,000
Construction in progress
Property, plant and equipment
Total property, plant and equipment	$ 3,964,000	$ 1,856,000