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Capital - Incentive and Share-based Compensation (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended
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May 31, 2018 USD ($) shares | Mar. 31, 2018 USD ($) vesting_installment shares | Feb. 28, 2018 USD ($) vesting_installment shares | May 31, 2017 USD ($) shares | Mar. 31, 2017 USD ($) vesting_installment shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares | Dec. 31, 2016 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Expected volatility rate look-back period (in years) |  |  |  |  |  | 6 years |  |
Weighted-average per unit or share fair value (in dollars per share) | $ / shares |  |  |  |  |  | $ 8.54 |  |
Age of grantee at which LTIP unit and restricted stock awards immediately vest |  |  |  |  |  | 60 years |  |
Period of service, upon completion of which, grantee's LTIP unit and restricted stock awards will immediately vest |  |  |  |  |  | 10 years |  |
Awards that Do Not Meet Age and Service Requirements for Vesting |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Noncash share-based compensation expense recognized | $ |  |  |  |  |  | $ 17.0 | $ 13.1 | $ 9.0
Unrecognized compensation expense | $ |  |  |  |  |  | $ 27.4 |  |
Unrecognized compensation expense, period for recognition (in years) |  |  |  |  |  | 2 years 2 months |  |
Awards that Meet Age and Service Requirements for Vesting |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Noncash share-based compensation expense recognized | $ |  |  |  |  |  | $ 1.8 | 1.0 | 0.7
Unrecognized compensation expense | $ |  |  |  |  |  | $ 1.0 |  |
Unrecognized compensation expense, period for recognition (in years) |  |  |  |  |  | 1 year 13 months 12 days |  |
Long-Term Incentive Plan Units and Restricted Stock [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Fair value of share-based awards granted in period | $ |  |  |  |  |  | $ 23.6 | $ 19.4 |
Weighted-average per unit or share fair value (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 13.77 |
Risk free interest rate |  |  |  |  |  | 2.50% |  |
Expected volatility rate |  |  |  |  |  | 20.00% |  |
Fair value vested in period | $ |  |  |  |  |  | $ 7.7 | $ 7.6 | 5.1
Long-Term Incentive Plan Unit |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares granted (in shares) |  |  |  |  |  | 2,719,801 |  |
Time Based Long-Tern Incentive Plan Unit |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares granted (in shares) |  |  |  |  | 47,993 |  |  |
Fair value of share-based awards granted in period | $ |  |  |  |  | $ 1.6 |  |  |
Time Based Long-Tern Incentive Plan Unit | 2013 Plan Units, Granted in March 2018 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares granted (in shares) |  | 67,449 |  |  |  |  |  |
Fair value of share-based awards granted in period | $ |  | $ 1.7 |  |  |  |  |  |
Award vesting period (in years) |  | 4 years |  |  |  |  |  |
Number of vesting installments (vesting installments) | vesting_installment |  | 3 |  |  |  |  |  |
Performance Based Long-Term Incentive Plan Unit |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares granted (in shares) |  |  |  |  | 95,156 |  |  |
Fair value of share-based awards granted in period | $ |  |  |  |  | $ 1.0 |  |  |
Performance Based Long-Term Incentive Plan Unit | 2013 Plan Units, Granted in March 2018 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares granted (in shares) |  | 223,950 |  |  |  |  |  |
Fair value of share-based awards granted in period | $ |  | $ 1.1 |  |  |  |  |  |
Award vesting period (in years) |  | 3 years |  |  |  |  |  |
Number of vesting installments (vesting installments) | vesting_installment |  | 2 |  |  |  |  |  |
Restricted Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares granted (in shares) |  |  |  |  |  | 39,608 |  |
Time Restricted Shares |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares granted (in shares) |  |  |  |  | 34,407 |  |  |
Time Restricted Shares | 2013 Plan Units, Granted in March 2018 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares granted (in shares) |  | 39,608 |  |  |  |  |  |
Long-Term Incentive Plan Unit and Restricted Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Fair value of share-based awards granted in period | $ |  |  |  |  |  |  |  | $ 18.4
Weighted-average per unit or share fair value (in dollars per share) | $ / shares |  |  |  |  |  | $ 8.54 |  | $ 9.60
Expected term |  |  |  |  |  | 2 years 9 months 12 days | 2 years 9 months 8 days |
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected dividend rate |  |  |  |  |  | 2.30% | 2.05% | 2.10%
Risk free interest rate |  |  |  |  |  |  | 1.55% |
Expected volatility rate |  |  |  |  |  |  | 20.00% |
Director | Time Based Long-Tern Incentive Plan Unit |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares granted (in shares) | 65,000 |  |  |  |  |  |  |
Fair value of share-based awards granted in period | $ | $ 1.0 |  |  |  |  |  |  |
Award vesting period (in years) | 3 years |  |  |  |  |  |  |
Director | Time Based Long-Tern Incentive Plan Unit | 2013 Plan Units Granted In May 2017 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares granted (in shares) |  |  |  | 50,408 |  |  |  |
Fair value of share-based awards granted in period | $ |  |  |  | $ 1.0 |  |  |  |
Award vesting period (in years) |  |  |  | 3 years |  |  |  |
Executive Officer | Time Based Long-Tern Incentive Plan Unit | 2013 Plan Units, Granted in March 2018 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares granted (in shares) |  | 386,876 |  |  |  |  |  |
Executive Officer | Time Based Long-Tern Incentive Plan Unit | 2013 Plan Units, Granted in February 2018 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares granted (in shares) |  |  | 238,609 |  |  |  |  |
Fair value of share-based awards granted in period | $ |  |  | $ 4.0 |  |  |  |  |
Award vesting period (in years) |  |  |  |  |  |  | 3 years |
Award vesting percentage of award face amount (in percentage) |  |  |  |  |  |  | 125.00% |
Executive Officer | Time Based Long-Tern Incentive Plan Unit | 2013 Plan Units, Granted in March 2017 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares granted (in shares) |  |  |  |  | 313,275 |  |  |
Fair value of share-based awards granted in period | $ |  |  |  |  | $ 6.1 |  |  |
Award vesting period (in years) |  |  |  |  | 4 years |  |  |
Number of vesting installments (vesting installments) | vesting_installment |  |  |  |  | 3 |  |  |
Executive Officer | Time Based Long-Tern Incentive Plan Unit | Vest immediately |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares granted (in shares) |  |  | 25,158 |  |  |  |  |
Executive Officer | Time Based Long-Tern Incentive Plan Unit | Vest over three years |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares granted (in shares) |  |  | 213,451 |  |  |  |  |
Award vesting period (in years) |  |  | 3 years |  |  |  |  |
Executive Officer | Time Based Long-Tern Incentive Plan Unit | Vest in two equal installments |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of vesting installments (vesting installments) | vesting_installment |  |  | 2 |  |  |  |  |
Executive Officer | Performance Based Long-Term Incentive Plan Unit | 2013 Plan Units, Granted in March 2018 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares granted (in shares) |  | 1,737,917 |  |  |  |  |  |
Executive Officer | Performance Based Long-Term Incentive Plan Unit | 2013 Plan Units, Granted in March 2017 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares granted (in shares) |  |  |  |  | 865,742 |  |  |
Fair value of share-based awards granted in period | $ |  |  |  |  | $ 9.6 |  |  |
Award vesting period (in years) |  |  |  |  | 3 years |  |  |
Number of vesting installments (vesting installments) | vesting_installment |  |  |  |  | 2 |  |  |
2013 Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized under the plan (in shares) |  |  |  |  |  | 12,200,000 |  |
Number of shares that remain available for future issuance (in shares) |  |  |  |  |  | 4,300,000 |  |
Maximum | Long-Term Incentive Plan Unit and Restricted Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Risk free interest rate |  |  |  |  |  |  |  | 0.84%
Minimum | Long-Term Incentive Plan Unit and Restricted Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Expected term |  |  |  |  |  |  |  | 2 years 10 months
Expected volatility rate |  |  |  |  |  |  |  | 24.00%

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + 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://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=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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, 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 (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 + Details
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