v2.4.0.6
Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of Allowance for Losses Progression      
Beginning balance January 1 $ 2,102 $ 2,582 $ 2,278
(Write offs) of bad debts, net of collections of previous write offs (38) (480) 4
Bad debt provision     304
Ending balance at December 31 $ 2,064 $ 2,102 $ 2,582