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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 |  |

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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. + 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 + Details
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- Definition 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. + 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 (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The ceiling 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. + 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 (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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