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Credit Facilities (Convertible Senior Notes and Capped Call Transactions) (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 10, 2013
USD ($)
d
$ / shares
$ / securities
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Line of Credit Facility [Line Items]        
Proceeds from convertible debt   $ 125,000 $ 0 $ 86,250
Amortization of debt issuance costs   (3,617) 0 $ (3,657)
Convertible notes   172,515 $ 70,407  
Payments of derivative issuance costs $ 7,400      
Convertible Senior Notes | 2.25% Convertible Senior Notes        
Line of Credit Facility [Line Items]        
Convertible notes, face amount $ 86,300      
Convertible notes, stated percentage 2.25%      
Proceeds from convertible debt $ 82,600      
Debt instrument, dedemption price, percentage 100.00%      
Convertible debt, conversion ratio 0.0416051      
Convertible debt, conversion price | $ / shares $ 24.04      
Debt instrument, debt default, declaration by note holders, percentage 25.00%      
Debt instrument, fair value $ 66,900      
Debt instrument, embedded conversion option 19,300      
Unamortized debt discount $ 3,700      
Convertible notes   74,000    
Deferred financing costs   1,900    
Derivative, cap price | $ / securities 29.02      
Convertible Senior Notes | 2.25% Convertible Senior Notes | Minimum        
Line of Credit Facility [Line Items]        
Estimated annual interest expense, debt   5,700    
Convertible Senior Notes | 2.25% Convertible Senior Notes | Maximum        
Line of Credit Facility [Line Items]        
Estimated annual interest expense, debt   $ 6,900    
Convertible Senior Notes | 2.25% Convertible Senior Notes | Other Assets        
Line of Credit Facility [Line Items]        
Unamortized debt discount $ 2,900      
Convertible Senior Notes | 2.25% Convertible Senior Notes | Additional Paid-in Capital        
Line of Credit Facility [Line Items]        
Unamortized debt discount $ 800      
Convertible Senior Notes | 2.25% Convertible Senior Notes | On or after December 15, 2016        
Line of Credit Facility [Line Items]        
Convertible debt redemption, trading days threshold | d 20      
Convertible debt redemption, consecutive trading days threshold 30 days      
Convertible debt redemption, percentage of stock price trigger, percentage 130.00%      
Debt instrument, dedemption price, percentage 100.00%      
Convertible Senior Notes | 2.25% Convertible Senior Notes | Business Day Immediately Preceding September 15, 2018        
Line of Credit Facility [Line Items]        
Convertible debt redemption, trading days threshold | d 20      
Convertible debt redemption, consecutive trading days threshold 30 days      
Convertible debt redemption, business days threshold | d 5      
Convertible debt redemption, consecutive business days threshold 5 years      
Convertible debt redemption, percentage of stock price trigger, percentage 130.00%      
Debt instrument, dedemption price, percentage 98.00%