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Stockholders' Equity - Narrative Restricted Stock Awards and Stock Option Grants (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Class of Stock [Line Items]
Weighted average exercise price (in dollars per share)	$ 19.52	$ 20.13
Restricted Stock
Class of Stock [Line Items]
Options vested in period, fair value	$ 4.0	$ 3.6	$ 4.5
Grants in period, weighted average grant date fair value (USD per share)	$ 15.25	$ 17.32	$ 18.24
Compensation not yet recognized,share-based awards other than options	$ 5.7	$ 6.2	$ 7.1
Compensation cost not yet recognized, period for recognition	2 years 4 months 20 days	2 years 6 months	2 years 10 months 28 days
Granted (in shares)	323
Performance Restricted Stock Units
Class of Stock [Line Items]
Compensation not yet recognized,share-based awards other than options	$ 0.4
Compensation cost not yet recognized, period for recognition	2 years 1 month 27 days
Granted (in shares)	45
Stock issued during period, value, restricted stock award, gross	$ 0.7
Employee Stock Option
Class of Stock [Line Items]
Compensation cost not yet recognized, period for recognition	1 year 8 months 26 days	2 years 10 months 2 days
Weighted average exercise price (in dollars per share)	$ 5.81	$ 3.79	$ 8.36
Compensation not yet recognized, stock options	$ 3.5	$ 4.5

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-Publisher FASB
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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Aggregate value of stock related to Restricted Stock Awards issued during the period.

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