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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Common Stock
Additional Paid-In Capital
Retained Earnings (Accumulated Deficit)
Total
Balances at Dec. 31, 2017 $ 15 $ 1,016,281 $ 55,702 $ 1,071,998
Balances (in shares) at Dec. 31, 2017 149,379      
Increase (Decrease) in Stockholders' Equity        
Net income (loss)     (2,598) (2,598)
Common stock issuance $ 1 63,479   63,480
Common stock issuance (in shares) 9,200      
Offering costs   (3,044)   (3,044)
Stock option exercises   323   323
Stock option exercises (in shares) 42      
Long-term incentive plan grants (in shares) 1,922      
Long-term incentive plan forfeitures (in shares) (74)      
Stock-based compensation   4,066   4,066
Balances at Mar. 31, 2018 $ 16 1,081,105 53,104 1,134,225
Balances (in shares) at Mar. 31, 2018 160,469      
Increase (Decrease) in Stockholders' Equity        
Net income (loss)     (16,274) (16,274)
Long-term incentive plan grants (in shares) 320      
Long-term incentive plan forfeitures (in shares) (136)      
Reduction in shares to cover individuals' tax withholding   (262)   (262)
Reduction in shares to cover individuals' tax withholding (in shares) (53)      
Stock-based compensation   5,194   5,194
Balances at Jun. 30, 2018 $ 16 1,086,037 36,830 1,122,883
Balances (in shares) at Jun. 30, 2018 160,600      
Increase (Decrease) in Stockholders' Equity        
Net income (loss)     (81,837) (81,837)
Long-term incentive plan grants (in shares) 84      
Long-term incentive plan forfeitures (in shares) (8)      
Stock-based compensation   5,404   5,404
Balances at Sep. 30, 2018 $ 16 1,091,441 (45,007) 1,046,450
Balances (in shares) at Sep. 30, 2018 160,676      
Increase (Decrease) in Stockholders' Equity        
Net income (loss)     146,668 146,668
Long-term incentive plan forfeitures (in shares) (43)      
Reduction in shares to cover individuals' tax withholding   (39)   (39)
Reduction in shares to cover individuals' tax withholding (in shares) (20)      
Stock-based compensation   3,965   3,965
Balances at Dec. 31, 2018 $ 16 1,095,367 101,661 1,197,044
Balances (in shares) at Dec. 31, 2018 160,613      
Increase (Decrease) in Stockholders' Equity        
Net income (loss)     (336,559) (336,559)
Long-term incentive plan grants (in shares) 4,153      
Long-term incentive plan forfeitures (in shares) (193)      
Reduction in shares to cover individuals' tax withholding   (406)   (406)
Reduction in shares to cover individuals' tax withholding (in shares) (253)      
Stock-based compensation   (6,416)   (6,416)
Balances at Mar. 31, 2019 $ 16 $ 1,088,545 $ (234,898) $ 853,663
Balances (in shares) at Mar. 31, 2019 164,320