Share-Based Compensation - Stock Options (Details)	9 Months Ended
	Sep. 30, 2021 $ / shares shares
Number of Options
Outstanding stock Options, December 31, 2020 (in shares) | shares	2,391,916
Granted (in shares) | shares	0
Exercised (in shares) | shares	(460,000)
Forfeited/cancelled/expired (in shares) | shares	(6,700)
Outstanding stock Options, September 30, 2021 (in shares) | shares	1,925,216
Weighted Average Exercise Price
Outstanding stock options, December 31, 2020 (in dollars per share) | $ / shares	$ 6.43
Granted (in dollars per share) | $ / shares	0
Exercised (in dollars per share) | $ / shares	5.08
Forfeited/cancelled/expired (in dollars per share) | $ / shares	3.81
Outstanding stock options, September 30, 2021 (in dollars per share) | $ / shares	$ 6.76