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Equity Awards - Restricted Stock Units Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 USD ($) number | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) number Rate shares | Jun. 30, 2017 USD ($) | Dec. 31, 2017
Restricted Stock Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted shares issued related to director fee deferrals |  |  | 4,509 |  |
Number of Unvested Restricted Stock Units Granted |  |  | 306,075 |  |
Unrecognized unvested restricted shares-based compensation expense | $ | $ 10.6 |  | $ 10.6 |  |
Weighted-average period for recognition of the unrecognized unvested restricted shares-based compensation expense |  |  | 2 years 5 months |  |
Plan 1 [Member] | Restricted Stock Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of Unvested Restricted Stock Units Granted |  |  | 140,183 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period |  |  | 3 years |  |
Plan 5 [Member] | Restricted Stock Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period |  |  | 1 year |  |
Plan 5 [Member] | Restricted Stock Units [Member] | Non-employee independent director [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of Unvested Restricted Stock Units Granted |  |  | 25,830 |  |
Plan 8 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of performance metrics in restricted shares award type plan | number | 2 |  | 2 |  |
Plan 8 [Member] | Restricted Stock Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of Unvested Restricted Stock Units Granted |  |  | 104,532 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period |  |  | 3 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate |  |  | 2.67% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate | Rate |  |  | 30.20% |  |
3 year EPS CAGR metric [Member] | Minimum [Member] | Plan 8 [Member] | Restricted Stock Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Amount of shares earned % of target award |  |  | 40.00% |  |
3 year EPS CAGR metric [Member] | Maximum [Member] | Plan 8 [Member] | Restricted Stock Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award percentage earned based on metric over the performance period |  |  | 50.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Amount of shares earned % of target award |  |  | 200.00% |  |
Total shareholder return metric [Member] | Plan 3 [Member] | Restricted Stock Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of Unvested Restricted Stock Units Granted |  |  | 31,021 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award percentage attained |  |  |  |  | 126.90%
Total shareholder return metric [Member] | Minimum [Member] | Plan 3 [Member] | Restricted Stock Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Amount of shares earned % of target award |  |  | 0.00% |  |
Total shareholder return metric [Member] | Minimum [Member] | Plan 8 [Member] | Restricted Stock Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Amount of shares earned % of target award |  |  | 0.00% |  |
Total shareholder return metric [Member] | Maximum [Member] | Plan 3 [Member] | Restricted Stock Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Amount of shares earned % of target award |  |  | 200.00% |  |
Total shareholder return metric [Member] | Maximum [Member] | Plan 8 [Member] | Restricted Stock Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award percentage earned based on metric over the performance period |  |  | 50.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Amount of shares earned % of target award |  |  | 200.00% |  |
Selling, General and Administrative Expenses [Member] | Restricted Stock Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted shares-based compensation expense | $ | $ 1.3 | $ 1.7 | $ 2.5 | $ 3.0 |

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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 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 estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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