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Employee Benefit Plans - Restricted Shares Granted (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Shares | 829,143 | 1,298,121 | 501,076
Grant Date Fair Value Per Share | $ 8.39 | $ 5.70 | $ 15.57
January 3, 2017 - 33% Per Year over Three Years [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Date of Grant | Jan. 03, 2017 |  |
Shares | 671,771 |  |
Grant Date Fair Value Per Share | $ 8.82 |  |
Vesting Percentage | 33.00% |  |
Vesting Period | 3 years |  |
January 3, 2017 - 100% on January 1, 2020 [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Date of Grant | Jan. 03, 2017 |  |
Shares | 671,771 |  |
Grant Date Fair Value Per Share | $ 12.64 |  |
Vesting Percentage | 100.00% |  |
Vesting Date | Jan. 01, 2020 |  |
January 3, 2017 - 100% on January 1, 2019 [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Date of Grant | Jan. 03, 2017 |  |
Shares | 9,956 |  |
Grant Date Fair Value Per Share | $ 8.82 |  |
Vesting Percentage | 100.00% |  |
Vesting Date | Jan. 01, 2019 |  |
April 3, 2017 - 100% on January 1, 2019 [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Date of Grant | Apr. 03, 2017 |  |
Shares | 8,004 |  |
Grant Date Fair Value Per Share | $ 7.77 |  |
Vesting Percentage | 100.00% |  |
Vesting Date | Jan. 01, 2019 |  |
July 3, 2017 - 100% on January 1, 2019 [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Date of Grant | Jul. 03, 2017 |  |
Shares | 14,018 |  |
Grant Date Fair Value Per Share | $ 5.64 |  |
Vesting Percentage | 100.00% |  |
Vesting Date | Jan. 01, 2019 |  |
October 2, 2017 - 100% on January 1, 2019 [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Date of Grant | Oct. 02, 2017 |  |
Shares | 7,654 |  |
Grant Date Fair Value Per Share | $ 7.39 |  |
Vesting Percentage | 100.00% |  |
Vesting Date | Jan. 01, 2019 |  |
December 7, 2017 - 100% on December 7, 2018 [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Date of Grant | Dec. 07, 2017 |  |
Shares | 117,740 |  |
Grant Date Fair Value Per Share | $ 6.37 |  |
Vesting Percentage | 100.00% |  |
Vesting Date | Dec. 07, 2018 |  |

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- Definition Grant date of share-based payment award. + References No definition available. + Details
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- Definition Vesting date of share-based payment award. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 (a)(1) -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 Percentage of vesting of share-based compensation awards. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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