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Incentive Compensation Plan Incentive Compensation Plan - Restricted Stock Awards Estimated to be Granted on a Performance Award (Details) - $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
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Mar. 24, 2017 | Feb. 23, 2017 | Dec. 19, 2016 | Sep. 30, 2016 | Sep. 19, 2016 | Jun. 07, 2016 | Mar. 01, 2016 | Mar. 01, 2016 | Mar. 01, 2016 | Feb. 18, 2016 | Dec. 30, 2015 | Jun. 26, 2015 | Feb. 20, 2015 | Feb. 20, 2015 | Feb. 05, 2015 | Jan. 26, 2015 | Jan. 15, 2015 | Nov. 18, 2014 | Apr. 08, 2014 | Mar. 25, 2014 | Mar. 05, 2014 | Jan. 27, 2014 | Jan. 01, 2014 | Aug. 16, 2013 | May 31, 2013 | Mar. 01, 2013 | Jan. 28, 2013 | Jan. 02, 2012 | Apr. 01, 2011 | Feb. 24, 2012 | Nov. 21, 2011 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Percentage Of Target Award Participants Earn |  | 40.00% |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  | 40.00% |  |  |  |  |  | 40.00% |  |  |  |  | 40.00% |  |  | 40.00% |  |  |  |
Performance Shares Awards As Percentage Of Target |  | 100.00% |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  | 100.00% |  |  |  |  |  | 100.00% |  |  |  |  | 100.00% |  |  | 100.00% |  |  |  |
Percentage Of Target Award Opportunities Maximum In Certain Cases |  | 200.00% |  |  |  |  |  |  |  | 200.00% |  |  |  |  |  | 200.00% |  |  |  |  |  | 200.00% |  |  |  |  | 200.00% |  |  | 200.00% |  |  |  |
Vesting period of restricted stock |  | 0 years |  |  |  |  |  |  |  | 0 years | 0 years |  |  |  |  | 0 years |  |  |  |  |  | 0 years |  |  |  |  | 1 year |  |  | 1 year |  |  |  |
Performance Based Stock Awards Vesting Period |  | 3 years |  |  |  |  |  |  |  | 3 years | 5 years |  |  |  |  | 3 years |  |  |  |  |  | 3 years |  |  |  |  | 3 years |  |  | 3 years |  |  |  |
Grant Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12.99 | $ 9.88 | $ 8.41
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 9.18 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14.32 |  |
Restricted Stock [Member] | March 24, 2017 Grant 4 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued to executive | 5,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant Price (in dollars per share) | $ 12.99 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting Date | Mar. 24, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Equal Vesting Periods | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock [Member] | Executive [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued to executive |  |  | 15,000 | 10,000 | 33,000 | 10,000 | 10,000 | 5,000 | 20,000 | 18,348 |  | 1,000 | 34,200 | 10,000 |  |  | 20,000 | 3,500 | 27,500 | 46,000 | 5,000 |  | 12,626 | 3,000 | 45,000 | 10,000 |  | 100,000 | 25,000 |  | 10,000 |  |  |
Grant Price (in dollars per share) |  |  | $ 13.96 | $ 10.09 | $ 10.02 | $ 9.34 | $ 8.84 | $ 8.84 | $ 8.84 | $ 8.43 |  | $ 9.84 | $ 8.45 | $ 8.45 |  |  | $ 8.38 | $ 9.26 | $ 8.89 | $ 9.18 | $ 8.75 |  | $ 8.82 | $ 7.57 | $ 7.21 | $ 7.35 |  | $ 5.26 | $ 6.82 |  | $ 4.41 |  |  |
Vesting Date |  |  | Dec. 19, 2019 | Sep. 30, 2019 | Sep. 19, 2019 | Jun. 07, 2019 | Mar. 01, 2019 | Mar. 01, 2019 | Aug. 31, 2017 | Dec. 31, 2016 |  | Jun. 26, 2018 | Dec. 31, 2015 | Aug. 31, 2017 |  |  | Jan. 15, 2017 | Nov. 17, 2017 | Apr. 08, 2017 | Mar. 24, 2017 | Mar. 04, 2017 |  | Dec. 31, 2014 | Aug. 16, 2016 | May 31, 2016 | Mar. 01, 2016 |  | Jan. 01, 2016 | Apr. 01, 2016 |  | Nov. 21, 2014 |  |  |
Number of Equal Vesting Periods |  |  | 3 | 1 | 3 | 1 | 1 | 1 | 1 | 1 |  | 1 | 1 | 1 |  |  | 1 | 1 | 3 | 1 | 1 |  | 1 | 1 | 3 | 1 |  | 4 | 1 |  | 1 |  |  |
Restricted Stock [Member] | Executive [Member] | Long Term Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued to executive |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,000 |  |  |  |
Grant Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8.55 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.96 |  |  |  |
Vesting Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Feb. 05, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2014 |  |  |  |
Number of Equal Vesting Periods |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
Restricted Stock [Member] | March 24, 2017 Grant 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued to executive | 7,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant Price (in dollars per share) | $ 12.99 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting Date | Aug. 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Equal Vesting Periods | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock [Member] | March 24, 2017 Grant 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued to executive | 7,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant Price (in dollars per share) | $ 12.99 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting Date | Mar. 24, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Equal Vesting Periods | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock [Member] | March 24, 2017 Grant 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued to executive | 7,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant Price (in dollars per share) | $ 12.99 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting Date | Aug. 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Equal Vesting Periods | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock [Member] | Executive [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued to executive |  | 93,500,000 |  |  |  |  |  |  |  | 160,650,000 | 60,000,000 |  |  |  |  | 125,000,000 |  |  |  |  |  | 125,000,000 |  |  |  |  | 128,611,000 |  |  | 68,000,000 |  |  |  |

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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 Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant 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 (a)(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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