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Long-Term Debt (Narrative) (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2016
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jan. 25, 2016
$ / shares
Debt Instrument [Line Items]        
Aggregate principal amount of notes issued $ 325,000 $ 325,000 $ 325,000  
Payment for capped call transactions 38,500      
Debt Cap Price       9.73
Net proceeds received 315,000      
Sale of Stock, Price Per Share | $ / shares       $ 5.56
Debt Issuance Costs 10,000      
Amortization period   7 years    
Capped Call Transactions Expenses $ 900      
Capped Call Transactions [Member]        
Debt Instrument [Line Items]        
Conversion Premium, Percentage       75.00%
Maximum [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Convertible, Terms of Conversion Feature   In addition, the holders of the Notes may require the Company to repurchase the Notes at par value plus accrued and unpaid interest following the occurrence of a Fundamental Change (as described in the Indenture). If a holder of the Notes converts upon a Make-Whole Adjustment Event (as described in the Indenture), they may be eligible to receive a make-whole premium through an increase to the conversion rate up to a maximum of 179.8561 shares per $1,000 principal amount of Notes (subject to other adjustments as described in the Indenture).    
Minimum [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Convertible, Terms of Conversion Feature   The Notes are initially convertible into approximately 47,716,900 shares of the Companys common stock based on the initial conversion rate of 146.8213 shares of the Companys common stock per$1,000principal amount of the Notes.    
Unsecured Debt [Member]        
Debt Instrument [Line Items]        
Convertible Notes Payable, Maturity Date   Feb. 01, 2023    
Conversion Premium, Percentage       22.50%
Annual Interest Rate of Notes (as a percent)   3.75%    
Debt Instrument, Convertible, Conversion Price | $ / shares       $ 6.81