Share-Based Compensation (RSUs Vested and Converted) (Details) (RSUs) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs vested during the year	1,037	942	1,138
RSUs converted during the year, net of shares withheld for taxes	1,734	905	761
Shares withheld for taxes	796	407	312

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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)(2)

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

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