Stock-based Compensation - Stock Options (Details) $ / shares in Units, $ in Thousands		3 Months Ended		12 Months Ended
	May 07, 2014 shares	Mar. 31, 2020 USD ($) item $ / shares shares	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) $ / shares shares
Stock-based Compensation
Unrecognized compensation cost		$ 41,700
Equity Incentive Plan 2010
Shares
Granted (in shares) | shares	0
Equity Incentive Plan 2014
Stock-based Compensation
Number of shares authorized | shares		4,948,064
Employee and Directors Stock Options
Stock-based Compensation
Term of award		10 years
Vesting period		3 years
Stock-based compensation		$ 0
Unrecognized compensation cost		$ 0
Shares
Balance at the beginning of the period (in shares) | shares		364,153
Exercised (in shares) | shares		(101,200)
Balance at the end of the period (in shares) | shares		262,953		364,153
Vested and exercisable at the end of the period (in shares) | shares		262,953
Exercise Price
Balance at the beginning of the period (in dollars per share) | $ / shares		$ 22.90
Exercised (in dollars per share) | $ / shares		20.00
Balance at the end of the period (in dollars per share) | $ / shares		24.02		$ 22.90
Vested and exercisable at the end of the period (in dollars per share) | $ / shares		$ 24.02
Remaining Contractual Term
Remaining Contractual Term (in years)		7 months 13 days		9 months
Vested and exercisable		7 months 13 days
Aggregate Intrinsic Value
Balance at the beginning of the period		$ 8,965
Exercised		1,460
Balance at the end of the period		306		$ 8,965
Vested and exercisable at the end of the period		$ 306
Restricted Stock Units
Stock-based Compensation
Number of different vesting criteria | item		4
Stock-based compensation		$ 4,400	$ 4,200
Restricted Stock Units | Vesting Tranche One
Stock-based Compensation
Vesting period		3 years
Restricted Stock Units | Vesting Tranche Three
Stock-based Compensation
Vesting period		3 years
Restricted Stock Units | Vesting Tranche Four
Stock-based Compensation
Vesting period		3 years
Restricted Stock Units | Minimum | Vesting Tranche Two
Stock-based Compensation
Vesting period		1 year
Restricted Stock Units | Maximum | Vesting Tranche Two
Stock-based Compensation
Vesting period		2 years
Restricted Stock With Total Shareholder Return Conditions | Minimum
Stock-based Compensation
Percentage of shares vested		0.00%
Restricted Stock With Total Shareholder Return Conditions | Maximum
Stock-based Compensation
Percentage of shares vested		200.00%