Quarterly report pursuant to sections 13 or 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Insurance [Abstract]  
Period of finite risk insurance policy 25 years
Maximum allowable coverage of insurance policy $ 39,000,000
Financial assurance coverage amount under insurance policy 38,679,000
Sinking fund related to the insurance policy 15,415,000
Interest earned on sinking fund 944,000
Interest income on sinking fund during the period 6,000
Insurer's obligation to entity on termination of contract (in hundredths) 100.00%
Financial assurance coverage amount under second insurance policy 7,800,000
Annual growth rate of financial assurance coverage amount under second insurance policy (in hundredths) 1.50%
Maximum financial assurance coverage amount under second insurance policy 8,200,000
Sinking fund related to the second insurance policy 5,899,000
Interest earned on sinking fund under second insurance policy 199,000
Interest income on sinking fund during the period under second insurance policy 1,000
Period of finite second insurance policy 4 years
Renewal fee for additional year under second insurance policy $ 46,000