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Common Stock (Restricted Stock and Units) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Restricted Stock, Time-vesting |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period in years | 3 years |  |
Percentage by award type | 63.00% |  |
Restricted Stock, Performance-based |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage by award type | 37.00% |  |
Restricted Stock |  |  |
Shares |  |  |
Non-vested at beginning of period (in shares) | 1,050,372 |  |
Granted to employees (in shares) | 1,494,022 |  |
Vested (in shares) | (615,941) |  |
Forfeited (in shares) | (299,433) |  |
Non-vested at end of period (in shares) | 1,629,020 | 1,050,372 |
Weighted-Average Fair Value - Date of Grant (in dollars per share) |  |  |
Non-vested at beginning of period (in dollars per share) | $ 3.47 |  |
Forfeited (in dollars per share) | 3.16 |  |
Vested (in dollars per share) | 3.72 |  |
Granted to employees (in dollars per share) | 2.62 | $ 10.62 | $ 11.92
Non-vested at end of period (in dollars per share) | $ 2.66 | $ 3.47 |
Fair value of vested restricted stock | $ 6.3 | $ 8.6 | $ 15.4
Award unrecognized compensation expense | $ 1.8 |  |
Award unrecognized compensation expense, expected period for recognition | 2 years |  |
Restricted Stock Units (RSUs) |  |  |
Shares |  |  |
Non-vested at beginning of period (in shares) | 301,766 |  |
Vested (in shares) | (29,720) |  |
Non-vested at end of period (in shares) | 1,038,474 | 301,766 |
Weighted-Average Fair Value - Date of Grant (in dollars per share) |  |  |
Non-vested at beginning of period (in dollars per share) | $ 3.94 |  |
Vested (in dollars per share) | 0 |  |
Non-vested at end of period (in dollars per share) | $ 3.24 | $ 3.94 |
Award unrecognized compensation expense, expected period for recognition | 1 year 3 months 18 days |  |
Awards granted (in shares) | 1,071,530 | 604,682 |
2018 | Restricted Stock Units (RSUs) |  |  |
Shares |  |  |
Forfeited (in shares) | (272,046) |  |
Weighted-Average Fair Value - Date of Grant (in dollars per share) |  |  |
Forfeited (in dollars per share) | $ 6.39 |  |
2019 | Restricted Stock Units (RSUs) |  |  |
Shares |  |  |
Granted to employees (in shares) | 1,071,530 |  |
Forfeited (in shares) | (62,776) |  |
Weighted-Average Fair Value - Date of Grant (in dollars per share) |  |  |
Forfeited (in dollars per share) | $ 1.66 |  |
Granted to employees (in dollars per share) | $ 3.75 |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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