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Equity - Restricted Stock (Details) - Restricted stock and performance-based stock units - USD ($) | 9 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Restricted stock awards |  |
Number of shares granted | 147,608 | 156,718
Compensation expense related to share-based award | $ 4,938,000 | $ 4,384,000
Nonvested awards |  |
Remaining compensation expense | 8,938 |
2019 |  |
Nonvested awards |  |
Remaining compensation expense | 1,627 |
2020 |  |
Nonvested awards |  |
Remaining compensation expense | 4,619 |
2021 |  |
Nonvested awards |  |
Remaining compensation expense | 2,503 |
2022 |  |
Nonvested awards |  |
Remaining compensation expense | $ 189 |
Grant Date Price $38.18 | Three year vesting |  |
Restricted stock awards |  |
Number of shares granted |  | 81,819
Granted (in dollars per share) |  | $ 38.18
Grant Date Price $38.18 | TSR Targets |  |
Restricted stock awards |  |
Number of shares granted |  | 66,171
Granted (in dollars per share) |  | $ 38.18
Vesting period |  | 4 years
Grant Date Price $38.18 | Accelerated TSR Targets |  |
Restricted stock awards |  |
Vesting period |  | 3 years
Grant Date Price $46.54 | Three year vesting |  |
Restricted stock awards |  |
Number of shares granted | 78,276 |
Granted (in dollars per share) | $ 46.54 |
Vesting period | 3 years | 3 years
Grant Date Price $46.54 | TSR Targets |  |
Restricted stock awards |  |
Number of shares granted | 60,836 |
Granted (in dollars per share) | $ 46.54 |
Vesting period | 4 years |
Grant Date Price $46.54 | Accelerated TSR Targets |  |
Restricted stock awards |  |
Vesting period | 3 years |
Grant Date Price $44.73 | Vesting Date, May 29, 2020 |  |
Restricted stock awards |  |
Number of shares granted | 8,496 |
Granted (in dollars per share) | $ 44.73 |
Grant Date Price $41.25 | Vesting Date, May 30, 2019 |  |
Restricted stock awards |  |
Number of shares granted |  | 8,728
Granted (in dollars per share) |  | $ 41.25

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + 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=116856206&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=116856206&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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=116856206&loc=d3e5070-113901 + Details
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