Income Taxes - Changes in Liability for Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Liability at Beginning of the Period	$ 23,322	$ 22,532	$ 33,632
Gross increase as a result of tax positions related to a prior period	25	223	46,034
Gross increase as a result of tax positions related to the current period	279	2,414	449
Gross decreases as a result of tax positions related to a prior period	(1,490)	(277)	(2,591)
Decreases related to settlements with taxing authorities	(525)	(1,568)	(45,130)
Reclassifications to income taxes payable			(1,615)
Decrease related to statute of limitations expirations	(229)	(2)	(8,247)
Liability at End of the Period	$ 21,382	$ 23,322	$ 22,532

Reclassifications to income taxes payable

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- Definition

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

+ References

No definition available.

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- Definition

Amount of unrecognized tax benefits.

+ References

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- Definition

Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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- Definition

Amount of increase 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 of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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