Stock-Based Compensation (Schedule of Performance Unit Awards) (Details) (USD $)	0 Months Ended	12 Months Ended
Mar. 15, 2011	Dec. 31, 2013 Incentive Plan, 2011-2013 [Member] Performance Shares [Member]	Dec. 31, 2013 Incentive Plan, 2012-2014 [Member] Performance Shares [Member]	Dec. 31, 2013 Incentive Plan, 2013-2015 [Member] Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date		March 15, 2011	March 6, 2012	February 27, 2013
Units		34,002	43,042	31,418
Grant Date Fair Value	$ 38.46	$ 38.46	$ 27.49	$ 42.49
Aggregate Fair Value		$ 1,308,000	$ 1,183,000	$ 1,335,000

The weighted average fair value at grant date for nonvested equity-based awards issued 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

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