Income Taxes (Summary of Changes in Gross Amount of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Uncertainties [Abstract]
Unrealized tax benefit, beginning balance	$ 49,598	$ 50,459	$ 51,004
Additions based on tax positions related to the current year	5,405	4,665	7,046
Additions based on tax positions related to prior years	995	0	0
Payments related to items settled with taxing authorities	(4,012)	(300)	(1,056)
Reduction due to lapse of statute of limitations and settlements	(15,058)	(5,226)	(6,535)
Unrealized tax benefit, ending balance	$ 36,928	$ 49,598	$ 50,459

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

+ Details

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- Definition

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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