v2.4.0.8
Commitments and Contingencies (Details) (USD $)
12 Months Ended
Dec. 31, 2013
patent
Dec. 31, 2012
Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]      
Operating lease commitments $ 31,905,000    
Rent expense 9,800,000 8,700,000 8,200,000
Sublease rental income 700,000 800,000 700,000
Open purchase orders and other contractual obligations 37,794,000    
Other contract commitments $ 9,946,000    
Number of patents involved in litigation 2