Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Status and Changes of Non-vested RSUs and PSUs (Details)

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Stock-Based Compensation - Status and Changes of Non-vested RSUs and PSUs (Details) - $ / shares
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2019
Jun. 30, 2018
Number of Shares (in thousands)        
Granted (shares)     2,500,000  
Restricted stock units        
Number of Shares (in thousands)        
Balance at beginning of period (shares)     1,551,000  
Granted (shares)     897,967 476,042
Forfeited (shares)     (13,000)  
Vested (shares)     (509,000)  
Balance at end of period (shares) 1,927,000 1,551,000 1,927,000  
Grant Date Fair Value per Share        
Outstanding at beginning of period (USD per share)     $ 15.74  
Granted (USD per share)     4.26  
Forfeited (USD per share)     15.46  
Vested (USD per share)     14.77  
Outstanding at end of period (USD per share) $ 10.65 $ 15.74 $ 10.65  
Weighted Average Remaining Life (in years)        
Outstanding at beginning of period 2 years 4 months 6 days 2 years 4 months 9 days 2 years 10 months 14 days  
Outstanding at end of period 2 years 4 months 6 days 2 years 4 months 9 days 2 years 10 months 14 days  
Performance stock units        
Number of Shares (in thousands)        
Balance at beginning of period (shares)     128,000  
Granted (shares)     323,000  
Forfeited (shares)     (1,000)  
Vested (shares)     (43,000)  
Balance at end of period (shares) 407,000 128,000 407,000  
Grant Date Fair Value per Share        
Outstanding at beginning of period (USD per share)     $ 5.49  
Granted (USD per share)     3.98  
Forfeited (USD per share)     5.49  
Vested (USD per share)     5.49  
Outstanding at end of period (USD per share) $ 4.29 $ 5.49 $ 4.29  
Weighted Average Remaining Life (in years)        
Outstanding at beginning of period 2 years 7 months 28 days 2 years 1 month 9 days 2 years 10 months 14 days  
Outstanding at end of period 2 years 7 months 28 days 2 years 1 month 9 days 2 years 10 months 14 days