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Stock-Based Compensation - Stock Option Activity (Details)
shares in Thousands
3 Months Ended
Mar. 31, 2020
$ / shares
shares
Number of Options  
Balance as of beginning of period (in shares) | shares 1,419
Stock options, granted (in shares) | shares 0
Stock options, exercised (in shares) | shares (136)
Stock options, forfeited (in shares) | shares 0
Balance as of end of period (in shares) | shares 1,283
Weighted Average Exercise Price  
Balance at beginning of period (in dollars per share) | $ / shares $ 23.61
Granted (in dollars per share) | $ / shares 0
Exercised (in dollars per share) | $ / shares 10.66
Forfeited (in dollars per share) | $ / shares 0
Balance at end of period (in dollars per share) | $ / shares $ 24.98