Schedule II - Valuation and Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Provision For Doubtful Accounts [Member]
   
Valuation and Qualifying Accounts Disclosure [Line Items]    
Balance at Beginning of Year $ 15 $ 35
Charged to Costs and Expense 15  
Deductions 7 20
Balance at End of Year 7 15
Deferred Tax Assets Valuation [Member]
   
Valuation and Qualifying Accounts Disclosure [Line Items]    
Balance at Beginning of Year 43,114 41,305
Charged to Costs and Expense 1,280 1,809
Balance at End of Year $ 44,394 $ 43,114