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Income Taxes Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Effective Tax Rate | (63.50%) | 33.50% | (16.90%) | 32.70% |  |  |
PROVISION/ (BENEFIT) FOR INCOME TAXES | $ (60,413) | $ 29,668 | $ (31,604) | $ 58,807 |  |  |
U.S Federal Statutory Income Tax Rate |  |  |  |  |  |  | 35.00%
Income Taxes Paid |  |  | 38,163 | 44,539 |  |  |
Unrecognized Tax Benefits | 9,607 |  | 9,607 |  |  |  | $ 9,607
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 8,679 |  | 8,679 |  |  |  | 8,679
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 1,318 | $ 1,284 | 1,318 | $ 1,284 |  |  | 1,318
Minimum [Member] |  |  |  |  |  |  |
Expiration of statutes of limitations impact on UTB balance | 500 |  | 500 |  |  |  | 500
Maximum [Member] |  |  |  |  |  |  |
Expiration of statutes of limitations impact on UTB balance | 1,500 |  | 1,500 |  |  |  | 1,500
Scenario, Forecast [Member] |  |  |  |  |  |  |
U.S Federal Statutory Income Tax Rate |  |  |  |  | 21.00% | 28.00% |
Tax Cuts and Jobs Act [Member] |  |  |  |  |  |  |
PROVISION/ (BENEFIT) FOR INCOME TAXES | (96,766) |  |  |  |  |  |
Other Recent Tax Pronouncements [Member] |  |  |  |  |  |  |
Unrecognized Tax Benefits | $ 3,391 |  | $ 3,391 |  |  |  | $ 3,391

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