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Stockholders' Equity and Stock Incentive Plans (Stock Options by Exercise Price Range) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Total intrinsic value of in-the-money options exercised during the period	$ 7.8	$ 3.9	$ 5.9
Options outstanding	1,179,026
Options outstanding, weighted-average remaining contractual life		4 years 6 months 5 days
Options outstanding, weighted-average exercise price	$ 11.98
Options exercisable	1,106,860
Options exercisable, weighted-average exercise price	$ 11.60
Range of exercise prices, low	5.22
Range of exercise prices, high	$ 39.78
Total fair value of options vested in period	$ 1.2	$ 1.6	$ 2.0
$5.22
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	25,510
Options outstanding, weighted-average remaining contractual life		3 years 10 months 7 days
Options outstanding, weighted-average exercise price	$ 5.22
Options exercisable	25,510
Options exercisable, weighted-average exercise price	$ 5.22
Range of exercise prices, low	5.22
Range of exercise prices, high	$ 7.55
6.70
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	109,863
Options outstanding, weighted-average remaining contractual life		2 years 11 months 5 days
Options outstanding, weighted-average exercise price	$ 6.70
Options exercisable	109,863
Options exercisable, weighted-average exercise price	$ 6.70
Range of exercise prices, low	8.34
Range of exercise prices, high	$ 8.34
7.55
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	38,000
Options outstanding, weighted-average remaining contractual life		9 months 30 days
Options outstanding, weighted-average exercise price	$ 7.55
Options exercisable	38,000
Options exercisable, weighted-average exercise price	$ 7.55
Range of exercise prices, low	9.86
Range of exercise prices, high	$ 9.86
8.34
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	283,147
Options outstanding, weighted-average remaining contractual life		1 year 9 months 19 days
Options outstanding, weighted-average exercise price	$ 8.34
Options exercisable	283,147
Options exercisable, weighted-average exercise price	$ 8.34
Range of exercise prices, low	11.57
Range of exercise prices, high	$ 11.57
9.86
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	202,068
Options outstanding, weighted-average remaining contractual life		4 years 10 months 7 days
Options outstanding, weighted-average exercise price	$ 9.86
Options exercisable	202,068
Options exercisable, weighted-average exercise price	$ 9.86
Range of exercise prices, low	17.75
Range of exercise prices, high	$ 17.75
11.57
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	157,322
Options outstanding, weighted-average remaining contractual life		4 years 9 months 23 days
Options outstanding, weighted-average exercise price	$ 11.57
Options exercisable	157,322
Options exercisable, weighted-average exercise price	$ 11.57
Range of exercise prices, low	19.98
Range of exercise prices, high	$ 19.98
17.75
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	207,337
Options outstanding, weighted-average remaining contractual life		7 years 10 months 7 days
Options outstanding, weighted-average exercise price	$ 17.75
Options exercisable	135,171
Options exercisable, weighted-average exercise price	$ 17.75
Range of exercise prices, low	33.31
Range of exercise prices, high	$ 33.31
19.98
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	155,779
Options outstanding, weighted-average remaining contractual life		6 years 3 months 16 days
Options outstanding, weighted-average exercise price	$ 19.98
Options exercisable	155,779
Options exercisable, weighted-average exercise price	$ 19.98
Range of exercise prices, low	38.11
Range of exercise prices, high	38.11
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range Nine [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, low	39.78
Range of exercise prices, high	39.78
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range Ten [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, low	42.69
Range of exercise prices, high	$ 42.69

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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