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Marketable Securities (Schedule of Debt Securities by Major Interest Type) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Up To 2% [Member]
Dec. 31, 2013
Up To 2% [Member]
Maximum [Member]
Dec. 31, 2013
2.05% - 2.951% [Member]
Dec. 31, 2013
2.05% - 2.951% [Member]
Minimum [Member]
Dec. 31, 2013
2.05% - 2.951% [Member]
Maximum [Member]
Dec. 31, 2012
Up to 2% [Member]
Dec. 31, 2012
Up to 2% [Member]
Maximum [Member]
Dec. 31, 2012
2.038% - 2.951% [Member]
Dec. 31, 2012
2.038% - 2.951% [Member]
Minimum [Member]
Dec. 31, 2012
2.038% - 2.951% [Member]
Maximum [Member]
Schedule of Held-to-maturity Securities [Line Items]                        
Amortized cost $ 39,632 [1] $ 41,477 [1] $ 34,945   $ 4,687     $ 33,145   $ 8,332    
Net unrealized holding gains/(losses) (154) 34 (217)   63     (84)   118    
Aggregate fair value $ 39,478 [2] $ 41,511 [2] $ 34,728   $ 4,750     $ 33,061   $ 8,450    
Interest rate       2.00%   2.05% 2.951%   2.00%   2.038% 2.951%
[1] Including accrued interest in the amount of $425K and $391K as of December 31, 2012 and 2013 respectively.
[2] Fair value is being determined using quoted market prices in active markets (Level 1).