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Common Stock (Restricted Stock and Units) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restricted Stock, Time-vesting |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage by award type | 100.00% |  |
Restricted Stock, Time-vesting | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period in years | 3 years |  |
Restricted Stock, Performance-based |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage by award type | 0.00% |  |
Restricted Stock |  |  |
Shares |  |  |
Non-vested at beginning of period (in shares) | 683,242 |  |
Forfeited (in shares) | (121,986) |  |
Granted to employees (in shares) | 260,029 |  |
Granted in service provider (in shares) | 15,000 |  |
Vested (in shares) | (590,027) |  |
Non-vested at end of period (in shares) | 246,258 | 683,242 |
Weighted-Average Fair Value - Date of Grant (in dollars per share) |  |  |
Non-vested at beginning of period (in dollars per share) | $ 15.92 |  |
Forfeited (in dollars per share) | 17.48 |  |
Granted to employees (in dollars per share) | 10.62 | $ 11.92 | $ 16.15
Granted to service provider (in dollars per share) | 9.34 |  |
Vested (in dollars per share) | 14.63 |  |
Non-vested at end of period (in dollars per share) | $ 12.24 | $ 15.92 |
Fair value of vested restricted stock | $ 8.6 | $ 15.4 | $ 13.7
Award unrecognized compensation expense | $ 1.7 |  |
Award unrecognized compensation expense, expected period for recognition | 11 months 1 day |  |
Restricted Stock Units (RSUs) |  |  |
Shares |  |  |
Non-vested at beginning of period (in shares) | 768,393 |  |
Non-vested at end of period (in shares) | 725,331 | 768,393 |
Weighted-Average Fair Value - Date of Grant (in dollars per share) |  |  |
Non-vested at beginning of period (in dollars per share) | $ 12.02 |  |
Non-vested at end of period (in dollars per share) | $ 16.41 | $ 12.02 |
Units to be converted (in shares) | 252,405 |  |
Award unrecognized compensation expense | $ 8.5 |  |
Award unrecognized compensation expense, expected period for recognition | 1 year 8 months 23 days |  |
Awards granted (in shares) | 604,682 | 768,393 |
2016 | Restricted Stock Units (RSUs) |  |  |
Shares |  |  |
Forfeited (in shares) | (263,585) |  |
Share equivalents not earned (in shares) | (252,403) |  |
Vested (in shares) | (252,405) |  |
Weighted-Average Fair Value - Date of Grant (in dollars per share) |  |  |
Forfeited (in dollars per share) | $ 12.02 |  |
Share equivalents not earned (in dollars per share) | 12.02 |  |
Vested (in dollars per share) | $ 12.02 |  |
2017 | Restricted Stock Units (RSUs) |  |  |
Shares |  |  |
Forfeited (in shares) | (131,756) |  |
Granted to employees (in shares) | 604,682 |  |
Weighted-Average Fair Value - Date of Grant (in dollars per share) |  |  |
Forfeited (in dollars per share) | $ 18.48 |  |
Granted to employees (in dollars per share) | $ 18.70 |  |

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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 equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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 (c)(1)(iv)(3) -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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- 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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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