Annual report pursuant to Section 13 and 15(d)

Income Per Share - Calculation (Details)

v3.10.0.1
Income Per Share - Calculation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net income - basic and diluted $ 38,553 $ 42,658 $ 27,153 $ 26,388 $ 104,991 $ 31,393 $ 23,460 $ (1,710) $ 134,752 $ 158,133 $ 72,606
Weighted average number of common shares outstanding - basic                 34,921,318 35,897,641 37,585,777
Dilutive effect of common stock equivalents:                      
Stock options                 281,932 267,939 60,423
Weighted average number of common shares outstanding - diluted                 35,613,319 36,572,146 37,867,212
Basic net income per common share $ 1.12 $ 1.22 $ 0.77 $ 0.75 $ 3.00 $ 0.90 $ 0.64 $ (0.05) $ 3.86 $ 4.41 $ 1.93
Diluted net income per common share $ 1.10 $ 1.19 $ 0.76 $ 0.74 $ 2.93 $ 0.88 $ 0.63 $ (0.05) $ 3.78 $ 4.32 $ 1.92
Service-based conditions                      
Dilutive effect of common stock equivalents:                      
Restricted stock awards                 151,324 221,497 192,705
Market-based conditions                      
Dilutive effect of common stock equivalents:                      
Restricted stock awards                 238,313 185,069 28,307
Performance-based conditions                      
Dilutive effect of common stock equivalents:                      
Restricted stock awards                 20,432