Stock-Based Compensation (Details Textual)	3 Months Ended
Mar. 31, 2013
Stock Options [Member]
Stock Based Compensation (Textual) [Abstract]
Weighted average period for amortization of unrecognizable compensation for compensation arrangements	1 year 7 months 6 days
Stock Awards [Member]
Stock Based Compensation (Textual) [Abstract]
Weighted average period for amortization of unrecognizable compensation for compensation arrangements	2 years 6 months
SARs [Member]
Stock Based Compensation (Textual) [Abstract]
Weighted average period for amortization of unrecognizable compensation for compensation arrangements	1 year 7 months 6 days

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

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

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