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Line of Credit (Details) (USD $)
In Thousands, unless otherwise specified
1 Months Ended
Feb. 28, 2013
Dec. 31, 2007
Line of Credit Facility [Line Items]    
Credit facility with a bank 40,000 25,000
Credit Facility [Member]
   
Line of Credit Facility [Line Items]    
Description of interest rate of credit facility   LIBOR
Line of credit interest rate (in percent)   0.843%
Line of credit basis points   2.00%
Line of credit unused portion per year (in percent)   0.375%
Revolving credit facility, expiration date Jun. 15, 2014