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Income Taxes - Reconciliation of Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |  |  |
Computed expected tax expense |  |  |  | $ 13,044 | $ 4,640 | $ 681
State income taxes, net of federal tax effect |  |  |  | 4,748 | (1,129) | 6
Changes in state DTL for mergers |  |  |  | 0 | 0 | 3,320
Excess share based compensation |  |  |  | (1,254) | (3,314) | (1,709)
Nondeductible merger expenses |  |  |  | 0 | 0 | 801
Revaluation of U.S. deferred income taxes |  |  |  | (760) | (53,449) | 0
Other, net |  |  |  | (261) | 119 | (259)
Income tax expense (benefit) | $ 3,531 | $ 1,828 | $ 5,359 | $ 15,517 | $ (53,133) | $ 2,840

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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to excess tax benefit for share-based compensation cost. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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