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Fair Value Measurement (Details 1) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Current Restricted Certificates of Deposit    
Cost $ 4,403 $ 9,870
Recorded Basis 5,349 16,748
Current Available-for-sale [Member]
   
Current Restricted Certificates of Deposit    
Cost 5,361 16,728
Recorded Basis 5,349 16,748
Current Available-for-sale [Member] | Restricted Certificates of Deposit [Member]
   
Current Restricted Certificates of Deposit    
Cost 63,944 0
Gross Unrealized Gains 0 0
Recorded Basis $ 63,944 $ 0