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Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Apr. 24, 2018 director $ / shares shares | Feb. 15, 2018 $ / shares shares | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Feb. 04, 2018 $ / shares
Stock-Based Compensation |  |  |  |  |
Stock-based compensation expense | $ |  |  | $ 3.1 | $ 8.0 |
Unrecognized compensation cost and vesting period |  |  |  |  |
Unrecognized compensation costs related to unvested share-based compensation arrangements | $ |  |  | $ 16.9 |  |
Weighted-average period for recognition of unrecognized stock-based compensation expense |  |  | 2 years 5 months 30 days |  |
Restricted Stock Units |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Awarded (in shares) | shares |  | 176,882 |  |  |
Weighted average granted date fair value (in dollars per share) | $ / shares |  | $ 54.97 |  |  |
Closing price per share (in dollars per share) | $ / shares |  |  |  |  | $ 57.16
Vesting period |  | 3 years |  |  |
Restricted Stock Units | Subsequent Event |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Awarded (in shares) | shares | 1,475 |  |  |  |
Number of Non-Employee Directors | director | 8 |  |  |  |
Employees | Restricted Stock Units |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Vesting period |  | 4 years |  |  |
Non Employee Directors | Restricted Stock Units | Subsequent Event |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Awarded (in shares) | shares | 11,800 |  |  |  |
Closing price per share (in dollars per share) | $ / shares | $ 55.34 |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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