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Stock-based Compensation - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
	May 07, 2014	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Stock-based Compensation
Unrecognized compensation cost		$ 29,100		$ 29,100
Equity Incentive Plan 2010
Shares
Granted (in shares)	0
Equity Incentive Plan 2014
Stock-based Compensation
Number of shares authorized		4,860,870		4,860,870
Employee and Directors Stock Options
Stock-based Compensation
Stock-based compensation		$ 0	$ 0	$ 0	$ 0
Unrecognized compensation cost		$ 0		$ 0
Shares
Balance at the beginning of the period (in shares)				364,153
Exercised (in shares)				(244,153)
Balance at the end of the period (in shares)		120,000		120,000		364,153
Vested and exercisable at the end of the period (in shares)		120,000		120,000
Exercise Price
Balance at the beginning of the period (in dollars per share)				$ 22.90
Exercised (in dollars per share)				20.00
Balance at the end of the period (in dollars per share)		$ 28.80		28.80		$ 22.90
Vested and exercisable at the end of the period (in dollars per share)		$ 28.80		$ 28.80
Remaining Contractual Term
Remaining Contractual Term (in years)				6 months 25 days		9 months
Vested and exercisable				6 months 25 days
Aggregate Intrinsic Value
Balance at the beginning of the period				$ 8,965
Exercised				3,078
Balance at the end of the period		$ 74		74		$ 8,965
Vested and exercisable at the end of the period		74		74
Restricted Stock Units
Stock-based Compensation
Stock-based compensation		$ 6,600	$ 4,900	$ 15,000	$ 14,900

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