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Debt - Conversion and Earnings Per Share Impact (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2013
d
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]      
Reclassifications of permanent to temporary equity, debt conversion   $ 6,100,000  
Dollar amount of converted notes   0 $ 0
2017 Convertible Senior Notes [Member]      
Debt Instrument [Line Items]      
Convertible debt, threshold percentage of stock price trigger (exceeded) 130.00%    
Convertible debt, threshold trading days (more than) | d 20    
Convertible debt, threshold consecutive trading days 30 days    
Convertible notes, fair value   109,500,000  
2017 Convertible Senior Notes [Member] | Secured Debt [Member]      
Debt Instrument [Line Items]      
Gain (loss) on debt conversion   $ 0