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Basis of Presentation and Principles of Consolidation - Reclassification (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Additional paid-in capital	$ 3,689,330				$ 3,744,621
As Reported
Additional paid-in capital		$ 4,023,962	$ 4,007,937	$ 4,007,540	4,007,514	$ 4,022,138
Common stock, par value (in dollars per share)		147	146	146	146	144
Treasury stock, at cost		(283,256)	(263,515)	(263,512)	(262,954)	(262,954)
APIC_CommonStock_TreasuryStock		3,740,853	3,744,568	3,744,174	3,744,706	3,759,328
Change
Additional paid-in capital		(283,193)	(263,454)	(263,451)	(262,893)	(262,893)
Common stock, par value (in dollars per share)		(63)	(61)	(61)	(61)	(61)
Treasury stock, at cost		283,256	263,515	263,512	262,954	262,954
APIC_CommonStock_TreasuryStock		0	0	0	0	0
As Adjusted
Additional paid-in capital		3,740,769	3,744,483	3,744,089	3,744,621	3,759,245
Common stock, par value (in dollars per share)		84	85	85	85	83
Treasury stock, at cost		0	0	0	0	0
APIC_CommonStock_TreasuryStock		$ 3,740,853	$ 3,744,568	$ 3,744,174	$ 3,744,706	$ 3,759,328

X

- Definition

The sum of APIC, common stock and treasury stock.

+ References

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Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.30(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 31
-Article 5

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- Definition

Value of all classes of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares exclude common shares repurchased by the entity and held as treasury shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 30
-Article 5

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656

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