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Stock-Based Compensation - Restricted Stock, Restricted Stock Units, and Performance Units Activity - Narratives (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Performance-based restricted stock units
Stock-Based Compensation
Dividend yield ( percent)	0.00%
Restricted stock, restricted stock units, performance units, cash settled restricted stock units and cash settled performance units
Unrecognized compensation
Expected unrecognized compensation cost related to unvested awards (in dollars)	$ 13.7
Weighted-average period over which the expected unrecognized compensation cost related to unvested stock options will be recognized	1 year 9 months 18 days
Payments for vested shares	$ 1.3	$ 1.1	$ 1.8
Restricted stock, restricted stock units, performance units, cash settled restricted stock units and cash settled performance units | First anniversary vesting
Stock-Based Compensation
Vesting percentage	33.33%
Restricted stock, restricted stock units, performance units, cash settled restricted stock units and cash settled performance units | Second anniversary vesting
Stock-Based Compensation
Vesting percentage	33.33%
Restricted stock, restricted stock units, performance units, cash settled restricted stock units and cash settled performance units | Third anniversary vesting
Stock-Based Compensation
Vesting percentage	33.33%
Vesting period	3 years

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