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Common Stock (Restricted Stock and Units) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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 | 84.00% |  |
Restricted Stock, Performance-based |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage by award type | 16.00% |  |
Restricted Stock |  |  |
Shares |  |  |
Non-vested at beginning of period (in shares) | 246,258 |  |
Granted to employees (in shares) | 1,287,484 |  |
Conversion of units (in shares) | 252,405 |  |
Vested (in shares) | (578,114) |  |
Forfeited (in shares) | (157,661) |  |
Non-vested at end of period (in shares) | 1,050,372 | 246,258 |
Weighted-Average Fair Value - Date of Grant (in dollars per share) |  |  |
Non-vested at beginning of period (in dollars per share) | $ 12.24 |  |
Granted to employees (in dollars per share) | 3.67 | $ 10.62 | $ 11.92
Conversion of units (in dollars per share) | 12.02 |  |
Vested (in dollars per share) | 10.82 |  |
Forfeited (in dollars per share) | 5.52 |  |
Non-vested at end of period (in dollars per share) | $ 3.47 | $ 12.24 |
Fair value of vested restricted stock | $ 6.3 | $ 8.6 | $ 15.4
Award unrecognized compensation expense | $ 2.7 |  |
Award unrecognized compensation expense, expected period for recognition | 2 years |  |
Restricted Stock Units (RSUs) |  |  |
Shares |  |  |
Non-vested at beginning of period (in shares) | 725,331 |  |
Conversion of units (in shares) | 252,405 |  |
Non-vested at end of period (in shares) | 301,766 | 725,331 |
Weighted-Average Fair Value - Date of Grant (in dollars per share) |  |  |
Non-vested at beginning of period (in dollars per share) | $ 16.41 |  |
Conversion of units (in dollars per share) | 12.02 |  |
Non-vested at end of period (in dollars per share) | $ 3.95 | $ 16.41 |
Award unrecognized compensation expense | $ 3.2 |  |
Award unrecognized compensation expense, expected period for recognition | 1 year 3 months 18 days |  |
Awards granted (in shares) | 407,698 | 604,682 |
2017 | Restricted Stock Units (RSUs) |  |  |
Shares |  |  |
Vested (in shares) | 0 |  |
Forfeited (in shares) | (121,514) |  |
Share equivalents not earned (in shares) | (351,412) |  |
Weighted-Average Fair Value - Date of Grant (in dollars per share) |  |  |
Vested (in dollars per share) | $ 0 |  |
Forfeited (in dollars per share) | 19.33 |  |
Share equivalents not earned (in dollars per share) | $ 18.56 |  |
2018 | Restricted Stock Units (RSUs) |  |  |
Shares |  |  |
Granted to employees (in shares) | 407,698 |  |
Forfeited (in shares) | (105,932) |  |
Weighted-Average Fair Value - Date of Grant (in dollars per share) |  |  |
Granted to employees (in dollars per share) | $ 3.95 |  |
Forfeited (in dollars per share) | $ 3.95 |  |

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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://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=109197908&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=109197908&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://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=109197908&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=109197908&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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