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Income Taxes Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2019 | Jun. 30, 2018
Effective Tax Rate | 22.90% | (90.40%) | 20.90% | (25.50%) |  |
Income Tax Expense (Benefit) | $ 20,219,000 | $ (76,557,000) | $ 40,034,000 | $ (46,412,000) |  |
Federal Statutory Income Tax Rate, Percent |  |  |  |  |  | 28.00%
Income Taxes Paid, Net |  |  | 25,211,000 | 38,163,000 |  |
Unrecognized Tax Benefits | 10,719,000 |  | 10,719,000 |  |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 9,967,000 |  | 9,967,000 |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 1,431,000 | $ 1,318,000 | 1,431,000 | 1,318,000 |  |
Minimum [Member] |  |  |  |  |  |
Expiration of statutes of limitations impact on UTB balance | 500,000 |  | 500,000 |  |  |
Maximum [Member] |  |  |  |  |  |
Expiration of statutes of limitations impact on UTB balance | 1,500,000 |  | $ 1,500,000 |  |  |
Tax Cuts and Jobs Act [Member] |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  | $ (97,516,000) |  |
Measurement period adjustment of income tax benefit recorded in prior period | $ 0 |  |  |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |
Federal Statutory Income Tax Rate, Percent |  |  |  |  | 21.00% |

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