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Convertible Debt (Details) (USD $)
3 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Dec. 31, 2013
2013 Convertible Senior Notes [Member]
Jun. 30, 2014
2015 Convertible Senior Notes [Member]
Jun. 30, 2014
Convertible Senior Notes [Member]
Jun. 30, 2013
Convertible Senior Notes [Member]
Jun. 30, 2014
Convertible Senior Notes [Member]
Jun. 30, 2013
Convertible Senior Notes [Member]
Jun. 30, 2013
Convertible Senior Notes [Member]
2013 Convertible Senior Notes [Member]
Jun. 29, 2012
Convertible Senior Notes [Member]
2015 Convertible Senior Notes [Member]
Jun. 30, 2014
Convertible Senior Notes [Member]
2015 Convertible Senior Notes [Member]
Jun. 30, 2013
Convertible Senior Notes [Member]
2015 Convertible Senior Notes [Member]
Debt Instrument [Line Items]                        
Convertible Notes Payable, Current $ 18,000,000 $ 0   $ 18,000,000                
Convertible senior notes 0 18,000,000 18,000,000                  
Debt Instrument, Convertible, Conversion Ratio                   117.2333    
Debt Instrument, Convertible, Conversion Ratio, Principal Amount                   1,000    
Debt Instrument, Convertible, Conversion Price                   $ 8.53    
Debt Instrument, Call Feature, Call Price, Percent of Principal                   100.00%    
Debt Instrument, Interest Rate, Effective Percentage                 3.73%   4.50% 4.50%
Contractually stated interest costs         203,000 202,000 405,000 463,000        
Amortization of interest costs         11,000 11,000 21,000 39,000        
Short-term Debt, Fair Value $ 17,900,000 $ 17,800,000