Share-Based Payments (Details 2)	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012
Market stock units [Member]
Schedule of stock option grants
Stock units	257,000	302,000
Cash settled performance shares [Member]
Schedule of stock option grants
Stock units	271,000	327,000
Time-vested restricted stock units [Member]
Schedule of stock option grants
Stock units	680,000	865,000

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration