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Borrowings (Narrative) (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Nov. 30, 2011
Senior Convertible Notes Due December 15, 2016 [Member]
Dec. 31, 2012
Institutional And Accredited Investor [Member]
Dec. 31, 2011
Institutional And Accredited Investor [Member]
Debt Instrument [Line Items]            
Principal amount of convertible notes       $ 152,000,000    
Interest rate 5.50%     5.50%    
Issuance of stock for 5.50% senior convertible notes, Value     17,770,000      
Discount on convertible notes     3,040,000      
Unamortized debt issuance costs     440,000      
Total equity component of convertible debt     18,210,000      
Unamortized discount on convertible notes 1,124,000 10,429,000        
Deferred tax liability on tax effect basis difference between carrying values and tax basis of the convertible notes     7,200,000      
Conversion ratio per $1 of principal 69.9032          
Convertible note, conversion rate per share $ 14.31          
Converted number of common stock shares 5,482          
Amount of notes converted 80,754,000 60,082,000        
Loss on conversion of convertible debt (11,275,000) (7,021,000)        
Convertible notes outstanding 12,540,000 90,960,000        
Shares of common stock that are convertible 876          
Notes issued with an effective yield           5.96%
Original issue discount         98.00%  
Recognized deferred tax liability tax effect   3,933,000        
Payment of discount and debt issuance costs           6,634,000
Proceeds from issuance of notes     148,960,000     145,366,000
Additional maximum convertible securities shares 1,118          
Adjusted conversion price after increase of conversion rate $ 11.22          
Recognized debt conversion loss in other expense net 11,275,000          
Debt maturity date       Dec. 15, 2016    
Interest expense 3,425,000 12,468,000 2,090,000      
Interest income $ 1,258,000 $ 168,000 $ 51,000