Share-Based Payments (Details 2) - shares	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Market stock units
Schedule of stock option grants
Stock units	146,000	175,000
Cash settled performance shares
Schedule of stock option grants
Stock units	73,000	112,000
Performance units
Schedule of stock option grants
Stock units	57,000	89,000
Time-vested restricted stock units
Schedule of stock option grants
Stock units	549,000	351,000

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