Income Taxes Income Taxes Details 6 (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning Balance	$ 182,545	$ 79,455	$ 178,326	$ 182,545
Reductions to tax positions related to the current year		(79,455)
Additions to tax positions related to prior years		1,348
Reductions to tax positions related to prior years		(16,100)
Reductions to tax positions as a result of audit settlement			(30,333)
Reductions to tax positions related to prior years	$ (4,219)		(68,538)
Ending Balance		1,348	79,455	178,326
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions		16,100
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		1,400	79,500	161,800
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued		500	11,100	57,300
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense		10,600	46,200	$ 5,700
Tax Adjustments, Settlements, and Unusual Provisions			143,000
Tax Settlement Payment			$ 34,200
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority		$ 5,600

Tax Settlement Payment

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The amount of the additional liability or refund received or expected based on a final settlement with a taxing authority.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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