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Debt - 2010 Convertible Notes (Details Textual)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 15, 2016
USD ($)
Jun. 30, 2016
USD ($)
$ / shares
Jun. 30, 2016
USD ($)
Tradingday
$ / shares
Jun. 30, 2015
USD ($)
$ / shares
Apr. 08, 2016
USD ($)
Debt Instrument [Line Items]          
Aggregate principal amount of convertible notes repurchased         $ 106,000
Amount paid to purchase aggregate principal amount         198,400
Loss on repurchase of convertible notes   $ (5,108) $ (8,319)    
Intrinsic value of conversion obligation   33,894 33,894    
Senior Subordinated Convertible Notes 2010          
Debt Instrument [Line Items]          
Aggregate principal amount of convertible notes repurchased $ 40,000       66,000
Amount paid to purchase aggregate principal amount 73,000       $ 126,000
Loss on repurchase of convertible notes $ (3,200) (5,100)      
Principal outstanding on Convertible Notes   $ 44,000 $ 44,000    
Initial conversion rate of common stock     43.9954 43.8047  
Convertible Notes, initial conversion of Par Value Convertible Notes to common stock     $ 1 $ 1  
Initial conversion price | $ / shares   $ 22.73 $ 22.73 $ 22.83  
Debt instrument, convertible, terms of conversion feature     Prior to September 1, 2016, holders of the 2010 Convertible Notes can 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.    
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   $ 34,000 $ 34,000    
Percentage of par value of convertible notes to be settled in cash     100.00%