Annual report pursuant to Section 13 and 15(d)

Equity Compensation - Summary of Company's Stock Option Activity and Related Information (Details)

v3.19.3.a.u2
Equity Compensation - Summary of Company's Stock Option Activity and Related Information (Details) - Stock Option - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Options      
Balance at beginning of the period (in shares) 1,327,919 1,506,604 1,539,017
Options granted (in shares) 138,300 120,270 118,612
Options exercised (in shares) (313,326) (274,941) (131,904)
Options forfeited (in shares) (36,848) (24,014) (19,121)
Balance at end of the period (in shares) 1,116,045 1,327,919 1,506,604
Exercisable at end of the period (in shares) 802,873 1,043,596 1,252,315
Weighted Average Exercise Price      
Balance at beginning of the period (in usd per share) $ 18.13 $ 14.65 $ 12.91
Options granted (in usd per share) 30.04 32.33 33.40
Options exercised (in usd per share) 5.38 3.89 9.77
Options forfeited (in usd per share) 21.56 34.13 24.27
Balance at end of the period (in usd per share) 23.07 18.13 14.65
Exercisable at end of the period (in usd per share) $ 19.79 $ 14.27 $ 11.17
Aggregate Intrinsic Value      
Balance at beginning of the period (in usd) $ 13,042 $ 23,801 $ 35,630
Options granted (in usd) (289) (226) 315
Options exercised (in usd) (7,072) (7,303) (3,467)
Options forfeited (in usd) (235) 88 (225)
Balance at end of the period (in usd) 5,446 16,360 32,253
Exercisable at end of the period (in usd) $ 6,551 $ 16,885 $ 31,177