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Goodwill (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Changes in carrying amount of goodwill      
Goodwill at January 1 $ 19,772    
Goodwill impairment during the period (49,521) (3,277) 0
Goodwill at end of period 0 19,772  
M2M Products and Solutions [Member]
     
Changes in carrying amount of goodwill      
Goodwill at January 1 19,772 22,258  
Goodwill acquisition price adjustments, net of tax 0 791  
Goodwill impairment during the period (19,772) (3,277)  
Goodwill at end of period $ 0 $ 19,772