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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, 2017	Dec. 31, 2016	Dec. 31, 2015
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	$ 3.9	$ 5.9	$ 11.1
Options outstanding	1,542,452
Options outstanding, weighted-average remaining contractual life		5 years 3 months 27 days
Options outstanding, weighted-average exercise price	$ 11.99
Options exercisable	1,335,717
Options exercisable, weighted-average exercise price	$ 11.00
Range of exercise prices, low	5.22
Range of exercise prices, high	$ 39.78
Total fair value of options vested in period	$ 1.6	$ 2.0	$ 1.9
$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		4 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
6.60
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	28,000
Options outstanding, weighted-average remaining contractual life		10 months 2 days
Options outstanding, weighted-average exercise price	$ 6.60
Options exercisable	28,000
Options exercisable, weighted-average exercise price	$ 6.60
Range of exercise prices, low	8.34
Range of exercise prices, high	$ 8.34
6.70
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	196,869
Options outstanding, weighted-average remaining contractual life		3 years 11 months 5 days
Options outstanding, weighted-average exercise price	$ 6.70
Options exercisable	196,869
Options exercisable, weighted-average exercise price	$ 6.70
Range of exercise prices, low	9.86
Range of exercise prices, high	$ 9.86
7.55
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	65,000
Options outstanding, weighted-average remaining contractual life		1 year 9 months 30 days
Options outstanding, weighted-average exercise price	$ 7.55
Options exercisable	65,000
Options exercisable, weighted-average exercise price	$ 7.55
Range of exercise prices, low	11.57
Range of exercise prices, high	$ 11.57
8.34
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	294,163
Options outstanding, weighted-average remaining contractual life		2 years 9 months 19 days
Options outstanding, weighted-average exercise price	$ 8.34
Options exercisable	294,163
Options exercisable, weighted-average exercise price	$ 8.34
Range of exercise prices, low	17.75
Range of exercise prices, high	$ 17.75
9.86
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	260,882
Options outstanding, weighted-average remaining contractual life		5 years 10 months 7 days
Options outstanding, weighted-average exercise price	$ 9.86
Options exercisable	260,882
Options exercisable, weighted-average exercise price	$ 9.86
Range of exercise prices, low	19.98
Range of exercise prices, high	$ 19.98
11.57
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	229,846
Options outstanding, weighted-average remaining contractual life		6 years 1 month 27 days
Options outstanding, weighted-average exercise price	$ 11.57
Options exercisable	229,846
Options exercisable, weighted-average exercise price	$ 11.57
Range of exercise prices, low	33.31
Range of exercise prices, high	$ 33.31
17.75
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	216,509
Options outstanding, weighted-average remaining contractual life		8 years 10 months 7 days
Options outstanding, weighted-average exercise price	$ 17.75
Options exercisable	72,174
Options exercisable, weighted-average exercise price	$ 17.75
Range of exercise prices, low	38.11
Range of exercise prices, high	$ 38.11
19.98
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	200,673
Options outstanding, weighted-average remaining contractual life		7 years 4 months 30 days
Options outstanding, weighted-average exercise price	$ 19.98
Options exercisable	138,273
Options exercisable, weighted-average exercise price	$ 19.98
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
Share-based Compensation, Shares Authorized Under Stock Option Plans, Exercise Price Range Nine [Member] [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	25,000
Options outstanding, weighted-average remaining contractual life		4 days
Options outstanding, weighted-average exercise price	$ 33.31
Options exercisable	25,000
Options exercisable, weighted-average exercise price	$ 33.31

X

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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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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