Income Taxes Reconciliation of the change in unrecognized tax benefits (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of the change in unrecognized tax benefits [Roll Forward]
Unrecognized Tax Benefits, beginning of period	$ 32,911	$ 173,310	$ 170,425
Increases related to tax positions taken during a prior period	5,763	0	12,877
Decreases related to tax positions taken during a prior period	0	(133,883)	(7,502)
Increases related to tax positions taken during the current period	318	237	381
Decreases related to settlements with taxing authorities	0	(6,753)	(1,434)
Reductions as a result of a lapse of the statute of limitations	0	0	(1,437)
Unrecognized Tax Benefits, end of period	$ 38,992	$ 32,911	$ 173,310

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

No definition available.

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- Definition

Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Unrecognized Tax Benefit
-URI http://asc.fasb.org/extlink&oid=6527854

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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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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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