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REDEMPTION SETTLEMENT ASSETS (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
REDEMPTION SETTLEMENT ASSETS    
Cost $ 503,576,000 $ 482,176,000
Unrealized Gains 7,083,000 10,613,000
Unrealized Losses (310,000) (99,000)
Total 510,349,000 492,690,000
Net carrying value of the redemption settlement assets by contractual maturity    
Due in one year or less 195,230,000  
Due after one year through five years 308,346,000  
Total 503,576,000  
Estimated fair value of the redemption settlement assets by contractual maturity    
Due in one year or less 196,584,000  
Due after one year through five years 313,765,000  
Total 510,349,000 492,690,000
Cash and cash equivalents
   
REDEMPTION SETTLEMENT ASSETS    
Cost 73,984,000 40,266,000
Total 73,984,000 40,266,000
Estimated fair value of the redemption settlement assets by contractual maturity    
Total 73,984,000 40,266,000
Government bonds
   
REDEMPTION SETTLEMENT ASSETS    
Cost   5,064,000
Unrealized Gains   53,000
Total   5,117,000
Estimated fair value of the redemption settlement assets by contractual maturity    
Total   5,117,000
Corporate bonds
   
REDEMPTION SETTLEMENT ASSETS    
Cost 429,592,000 436,846,000
Unrealized Gains 7,083,000 10,560,000
Unrealized Losses (310,000) (99,000)
Total 436,365,000 447,307,000
Estimated fair value of the redemption settlement assets by contractual maturity    
Total 436,365,000 447,307,000
Fair value for investments in unrealized loss position    
Less than 12 months $ 80,500,000 $ 36,500,000