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Fair Value Measurement: (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Dec. 31, 2012
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Mar. 31, 2013
Quoted prices in active markets for identical assets (level 1)
Certificates of Deposit [Member]
Dec. 31, 2012
Quoted prices in active markets for identical assets (level 1)
Certificates of Deposit [Member]
Mar. 31, 2013
Signifcant other observable inputs (level 2)
Available-for-sale Securities [Member]
Dec. 31, 2012
Signifcant other observable inputs (level 2)
Available-for-sale Securities [Member]
Jun. 30, 2012
Significant unobservable inputs (level 3)
Dec. 31, 2011
Significant unobservable inputs (level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available for sale securities $ 78,929 $ 79,259 $ 8,260 $ 8,490 $ 70,669 $ 70,769 $ 0 $ 0