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Equity - Restricted Stock (Details) - Restricted stock and performance-based stock units - USD ($) | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Restricted stock awards |  |
Number of shares granted | 156,718 | 143,057
Compensation expense related to share-based award | $ 4,384,000 | $ 3,965,000
Nonvested awards |  |
Remaining compensation expense | 8,184,000 |
2018 |  |
Nonvested awards |  |
Remaining compensation expense | 1,486,000 |
2019 |  |
Nonvested awards |  |
Remaining compensation expense | 4,250,000 |
2020 |  |
Nonvested awards |  |
Remaining compensation expense | 2,210,000 |
2021 |  |
Nonvested awards |  |
Remaining compensation expense | $ 238,000 |
Grant Date Price $38.18 | Three year vesting |  |
Restricted stock awards |  |
Number of shares granted | 81,819 |
Granted (in dollars per share) | $ 38.18 |
Vesting period | 3 years |
Grant Date Price $38.18 | TSR Targets |  |
Restricted stock awards |  |
Number of shares granted | 66,171 |
Granted (in dollars per share) | $ 38.18 |
Grant Date Price $41.25 | One year Vesting |  |
Restricted stock awards |  |
Number of shares granted | 8,728 |
Granted (in dollars per share) | $ 41.25 |
Vesting period | 1 year |
Grant Date Price $45.76 | Three year vesting |  |
Restricted stock awards |  |
Number of shares granted |  | 74,760
Granted (in dollars per share) |  | $ 45.76
Vesting period |  | 3 years
Grant Date Price $45.76 | TSR Targets |  |
Restricted stock awards |  |
Number of shares granted |  | 57,881
Granted (in dollars per share) |  | $ 45.76
Vesting period |  | 4 years
Grant Date Price $45.76 | Accelerated TSR Targets |  |
Restricted stock awards |  |
Vesting period |  | 3 years
Grant Date Price $48.55 | One year Vesting |  |
Restricted stock awards |  |
Number of shares granted |  | 7,416
Granted (in dollars per share) |  | $ 48.55
Vesting period |  | 1 year
Grant Date Price $50.55 [ Member] | Three year vesting |  |
Restricted stock awards |  |
Number of shares granted |  | 3,000
Granted (in dollars per share) |  | $ 50.55
Vesting period |  | 3 years

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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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