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Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Mar. 21, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Effective tax rate, percentage | (102.70%) | 32.20% | 23.10% | 25.50% |  |
Income tax benefit, revaluation of deferred tax assets |  |  |  |  | $ 115,291 |
Income tax benefit, reversal of valuation allowance for AMT credits |  |  |  |  | 154,384 |
Financial statement benefit, NOL carryback | $ 20,000 |  |  |  |  |
Total amount of uncertain tax positions | 39,953 |  | $ 39,953 |  | 37,813 |
Unrecognized tax benefits that would impact effective tax rate | 31,516 |  | 31,516 |  | 29,376 |
Change in unrecognized tax benefits |  |  | 2,140 |  |  |
Accrued interest liability | 814 |  | 814 |  | $ 644 |
Accrued interest expense | $ 169 |  | $ 169 |  |  |
Reduction of net operating loss |  |  |  |  |  | $ 108,651

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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