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Available-for-Sale Investments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Available-for-Sale Investments [Abstract]          
Accumulated other comprehensive income     $ 0   $ 393
Available-for-sale Securities, Gross Realized Gains     541    
Deferred Compensation Arrangement with Individual, Payment $ 2,800 $ 1,200 $ 3,931 $ 0