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Stockholders' Equity - Summary of Certain Information With Respect to the Performance Share Awards (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Expense | $ 500 |  | $ 500 |
Performance Shares |  |  |  |
Fair Value |  |  | 13,226 |
Accrual |  |  | 8,979 |
Expense | 2,392 | $ 1,367 | 3,770 | $ 3,025
Performance Shares | January 1, 2018 - December 31, 2020 |  |  |  |
Fair Value |  |  | 6,065 |
Accrual |  |  | 3,021 |
Expense | 1,295 | 279 | 1,886 | 523
Performance Shares | January 1, 2017 - December 31, 2019 |  |  |  |
Fair Value |  |  | 7,161 |
Accrual |  |  | 5,958 |
Expense | 1,097 | 509 | 1,884 | 1,109
Performance Shares | January 1, 2016 - December 31, 2018 |  |  |  |
Expense |  | 579 |  | 1,393
Performance Shares | January 1, 2019 - December 31, 2021 |  |  |  |
Fair Value |  |  | 4,829 |
Expense | $ 403 | $ 0 | $ 805 | $ 0

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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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