Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Contingency [Line Items]
Unrecognized tax benefits	$ 66,088,000	$ 77,089,000	$ 78,440,000	$ 176,089,000
Additions based on tax positions related to the current year	17,131,000	11,765,000	9,057,000
Additions for tax positions of prior years	2,900,000	1,564,000	10,899,000
Reductions for tax positions of prior years	(17,135,000)	(6,047,000)	(102,850,000)
Settlements	(1,153,000)	(998,000)	(5,346,000)
Lapse of statutes	(12,744,000)	(7,635,000)	(9,409,000)
Unrecognized potential tax benefits that would impact effective tax rate	50,300,000
Potential interest and penalty expense (income)	4,300,000	1,300,000	5,500,000
Accrued interest and penalties	13,900,000	15,500,000
Continuing Operations [Member]
Income Tax Contingency [Line Items]
Unrecognized tax benefits	55,366,000	66,367,000	65,226,000	121,864,000
Additions based on tax positions related to the current year	17,131,000	11,751,000	9,056,000
Additions for tax positions of prior years	2,900,000	1,065,000	7,584,000
Reductions for tax positions of prior years	(17,135,000)	(5,782,000)	(62,610,000)
Settlements	(1,153,000)	(843,000)	(2,823,000)
Lapse of statutes	(12,744,000)	(5,050,000)	(7,845,000)
Discontinued Operations [Member]
Income Tax Contingency [Line Items]
Unrecognized tax benefits	10,722,000	10,722,000	13,214,000	$ 54,225,000
Additions based on tax positions related to the current year	0	14,000	1,000
Additions for tax positions of prior years	0	499,000	3,315,000
Reductions for tax positions of prior years	0	(265,000)	(40,240,000)
Settlements	0	(155,000)	(2,523,000)
Lapse of statutes	0	$ (2,585,000)	$ (1,564,000)
Minimum [Member]
Income Tax Contingency [Line Items]
Significant change in unrecognized tax benefits is reasonably possible, estimated range of change, upper bound	0
Maximum [Member]
Income Tax Contingency [Line Items]
Significant change in unrecognized tax benefits is reasonably possible, estimated range of change, upper bound	$ 18,000,000

Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (d)(3)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)
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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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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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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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