Quarterly report pursuant to Section 13 or 15(d)

Income (Loss) Per Share - Calculation (Details)

v3.8.0.1
Income (Loss) Per Share - Calculation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Net income (loss) - basic and diluted $ 26,388 $ (1,710)
Weighted average number of common shares outstanding - basic 35,059,920 37,123,245
Dilutive effect of common stock equivalents:    
Stock options 346,477  
Weighted average number of common shares outstanding - diluted 35,819,242 37,123,245
Basic net income (loss) per common share $ 0.75 $ (0.05)
Diluted net income (loss) per common share $ 0.74 $ (0.05)
Service-based conditions    
Dilutive effect of common stock equivalents:    
Restricted stock awards 183,123  
Market-based conditions    
Dilutive effect of common stock equivalents:    
Restricted stock awards 229,722