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Fair Value Measurements (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Fair Value Measurements [Abstract]    
Fair value assets transferred from level 1 to level 2 $ 0  
Fair value of liabilities transferred from level 1 to level 2 0  
Carrying value of senior convertible notes 11,500 11,416
Estimated fair value of senior convertible notes 12,242 12,035
Asset impairments $ 0 $ 0