XML 65 R51.htm IDEA: XBRL DOCUMENT v3.6.0.2
Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2012
Net income loss available to common stockholders                        
Net income (loss) $ 5,032 $ 46,535 $ 34,035 $ 23,708 $ (9,066) $ 4,900 $ 2,983 $ 1,869 $ 109,310 $ 686 $ (183,822)  
Net income applicable to preferred stock                 8,662 67    
Net income applicable to common stock                 $ 100,648 $ 619    
Determination of shares:                        
Weighted-average common shares outstanding (in shares)                 82,929,000 80,003,000 78,425,000  
Assumed conversion of dilutive employee stock-based awards (in shares)                 1,299,000 2,217,000    
Assumed conversion of restricted stock (in shares)                 42,000 60,000    
Diluted weighted-average common shares outstanding before participating security                 84,270,000 82,280,000    
Assumed conversion of preferred stock (in shares)                 7,137,000 8,624,000    
Diluted weighted-average common shares outstanding (in shares)                 91,407,000 90,904,000 78,425,000  
Calculation of basic EPS:                        
Net income applicable to common stock                 $ 100,648 $ 619    
Weighted-average common shares outstanding (in shares)                 82,929,000 80,003,000 78,425,000  
Basic EPS (in dollars per share) $ 0.06 $ 0.52 $ 0.38 $ 0.26 $ (0.11) $ 0.06 $ 0.03 $ 0.02 $ 1.21 $ 0.01 $ (2.34)  
Calculation of diluted EPS using two class method:                        
Net income applicable to common stock                 $ 100,648 $ 619    
Diluted weighted-average common shares outstanding before participating security                 84,270,000 82,280,000    
Diluted EPS (in dollars per share) $ 0.05 $ 0.51 $ 0.37 $ 0.26 $ (0.11) $ 0.05 $ 0.03 $ 0.02 $ 1.19 $ 0.01 $ (2.34)  
Anti-dilutive securities, options to purchase shares outstanding                 3,036,819 1,635,929 6,633,622  
Series C Preferred Stock                        
Earnings Per Share                        
Number of shares converted                 8,624      
Preferred stock, shares outstanding 0       8,624       0 8,624 8,624 8,624
Conversion of preferred stock (in shares)                 8,624,000