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Stock-Based Compensation - Restricted Stock, Restricted Stock Units, and Performance Units Activity - Narratives (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Performance-based restricted stock units
Stock-Based Compensation
Performance period	2 years 9 months 28 days
Risk free rate (percent)	2.36%
Dividend yield ( percent)	0.00%
Expected grant date fair value (usd per share)	$ 13.46
Cash settled restricted stock units and cash settled performance units
Stock-Based Compensation
Non-vested awards at the end of the period (in shares)	216
Restricted stock shares, restricted stock units and performance units
Stock-Based Compensation
Non-vested awards at the end of the period (in shares)	1,512
Restricted stock, restricted stock units, performance units, cash settled restricted stock units and cash settled performance units
Stock-Based Compensation
Fair value of vested shares	$ 8.2	$ 10.8	$ 6.0
Non-vested awards at the end of the period (in shares)	1,728	1,440
Unrecognized compensation
Expected unrecognized compensation cost related to unvested awards (in dollars)	$ 10.7
Weighted-average period over which the expected unrecognized compensation cost related to unvested stock options will be recognized	2 years 2 months 12 days
Payments for vested shares	$ 1.1	$ 1.8	$ 0.6
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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