Equity Compensation (Schedule of Equity Compensation Performance Award Valuation Assumptions) (Details) (Performance Shares, USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Performance Shares
Schedule of Share Based Payment Award Performance Award Valuation Assumptions [Abstract]
Dividends per share (quarterly amounts)	$ 0.05	$ 0.05
Risk-free interest rate	1.60%	1.50%

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(iv)

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

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration