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Stock Based Compensation - Restricted stock units (Details) - Restricted stock units $ / shares in Units, $ in Thousands		3 Months Ended
	Mar. 31, 2021 USD ($) $ / shares shares	Mar. 31, 2021 USD ($) $ / shares shares
Stock-based compensation
Beginning balance | shares		358,825
Granted | shares		247,050
Vested | shares		(117,808)
Forfeited | shares		(9,071)
Ending balance | shares	478,996	478,996
Weighted Average Grant Date Fair Value, Beginning Balance | $ / shares		$ 33.04
Weighted Average Grant Date Fair Value, Granted | $ / shares		43.11
Weighted Average Grant Date Fair Value, Vested | $ / shares		31.75
Weighted Average Grant Date Fair Value, Forfeited | $ / shares		32.36
Weighted Average Grant Date Fair Value, Ending Balance | $ / shares	$ 38.56	$ 38.56
Compensation expense
Unamortized compensation expense related to unvested restricted stock units | $	$ 17,300	$ 17,300
Period to recognize unamortized compensation expense	2 years 7 months 6 days

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