Share-Based Payments (Details 2) - shares	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014
Market stock units
Schedule of stock option grants
Stock units	179,000	222,000
Cash settled performance shares
Schedule of stock option grants
Stock units	115,000	180,000
Performance units
Schedule of stock option grants
Stock units	89,000	50,000
Time-vested restricted stock units
Schedule of stock option grants
Stock units	375,000	418,000

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