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Stock-Based Incentive Plans Schedule of Grants by Type (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 25.00% |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Total Grants During the Period | 1,368,000,000 | 6,022,000,000
Share-based Compensation Arrangement by Share-based Payment Award, All Grants, Fair Value | $ 2,930,000 | $ 12,152,000
Employee Service Share-based Compensation, Awards with Performance Condiditons, Compensation Cost Not yet Recognized | $ 0 |
Unvested Shares with Market Based Vesting Conditions | 1,687,500 |
Employee Service Share-based Compensation, Awards with market Cond, Compensation Cost Not yet Recognized | $ 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 1,368,000 |
Share-based Compensation Arrangment by Share-based Payment Award, Options, Granted, Fair Value | $ 2,930,000 |
Minimum [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Market Based Vesting Conditions, price | $ 7.00 |
Maximum [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Market Based Vesting Conditions, price | $ 10.00 |
Time Based Vesting Conditions [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 1,368,000,000 | 3,434,000,000
Share-based Compensation Arrangment by Share-based Payment Award, Options, Granted, Fair Value | $ 2,930,000 | $ 5,704,000
Market Based Vesting Conditions [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 0 | 2,250,000,000
Share-based Compensation Arrangment by Share-based Payment Award, Options, Granted, Fair Value | $ 0 | $ 5,530,000
Performance Based Vesting Conditions [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 0 | 138,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Restricted Stock Awards, Granted, Fair Value | $ 0 | $ 431,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 0 | 200,000,000
Share-based Compensation Arrangment by Share-based Payment Award, Options, Granted, Fair Value | $ 0 | $ 487,000
Restricted Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments With Performance Conditions, Nonvested, Number, | 102,000 |

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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=6415400&loc=d3e5070-113901 + Details
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