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Debt - 2010 Convertible Notes (Details Textual)
6 Months Ended 9 Months Ended
Jun. 30, 2016
$ / shares
Sep. 30, 2016
USD ($)
Tradingday
$ / shares
Sep. 30, 2015
USD ($)
Sep. 02, 2016
USD ($)
Apr. 08, 2016
USD ($)
Mar. 15, 2016
USD ($)
Debt Instrument [Line Items]            
Principal outstanding on Convertible Notes   $ 34,700,000        
Intrinsic value of conversion obligation   28,690,000        
2010 Convertible Notes Converted by Holders            
Debt Instrument [Line Items]            
Aggregate principal amount of convertible notes repurchased   40,000        
Amount paid to purchase aggregate principal amount   100,000        
Senior Subordinated Convertible Notes 2010            
Debt Instrument [Line Items]            
Aggregate principal amount of convertible notes repurchased   115,300,000   $ 9,100,000 $ 66,200,000 $ 40,000,000
Amount paid to purchase aggregate principal amount   215,600,000   $ 17,200,000 $ 125,800,000 $ 72,600,000
Principal outstanding on Convertible Notes   $ 34,700,000        
Initial conversion rate of common stock 43.9954 44.1816        
Convertible Notes, initial conversion of Par Value Convertible Notes to common stock   $ 1,000 $ 1,000      
Initial conversion price | $ / shares $ 22.73 $ 22.63        
Debt instrument, convertible, terms of conversion feature   Prior to September 1, 2016, holders of the 2010 Convertible Notes could convert their securities at any time in the fiscal quarter following the period in which the price of our common stock trades over 130% of the conversion price for at least 20 consecutive trading days in the last 30 trading days of a fiscal quarter. On or after September 1, 2016, the holders of the 2010 Convertible Notes can elect to convert their securities at any time, with settlement occurring on March 1, 2017.        
Debt instrument, convertible, settlement date   Mar. 01, 2017        
Rate of conversion price   130.00%        
Debt instrument, convertible, threshold consecutive trading days   20 days        
Debt instrument, convertible, threshold trading days | Tradingday   30        
Intrinsic value of conversion obligation   $ 29,000,000        
Percentage of par value of convertible notes to be settled in cash   100.00%