Equity Based Plans (Details 3) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock options outstanding
Outstanding stock options	75,840	348,810	723,890	874,192
Weighted Average Remaining Contractual Term	2 years 2 months 12 days	2 years 7 months 6 days	3 years 7 months 6 days	4 years 7 months 6 days
Exercisable	75,840	348,810	723,890
Maximum [Member]
Stock options outstanding
Outstanding Stock Options, Exercise price	18.80	18.80	18.80
Exercisable, Exercise price	18.80	18.80	18.80
Minimum [Member]
Stock options outstanding
Outstanding Stock Options, Exercise price	12.51	12.51	12.51
Exercisable, Exercise price	12.51	12.51	12.51
1992 Plan [Member]
Stock options outstanding
Outstanding stock options	0	0	15,000
Outstanding Stock Options, Exercise price			16.34
Weighted Average Remaining Contractual Term			7 months 6 days
Exercisable			15,000
Exercisable, Exercise price			16.34
1999 Plan [Member]
Stock options outstanding
Outstanding stock options	15,840	17,310	43,390
Weighted Average Remaining Contractual Term	2 years 2 months 12 days	3 years 2 months 12 days	3 years 10 months 24 days
Exercisable	15,840	17,310	43,390
1999 Plan [Member] \| Maximum [Member]
Stock options outstanding
Outstanding Stock Options, Exercise price	18.42	18.42	18.42
Exercisable, Exercise price	18.42	18.42	18.42
1999 Plan [Member] \| Minimum [Member]
Stock options outstanding
Outstanding Stock Options, Exercise price	12.60	12.60	12.60
Exercisable, Exercise price	12.60	12.60	12.60
2003 Plan [Member]
Stock options outstanding
Outstanding stock options	60,000	251,500	541,500
Weighted Average Remaining Contractual Term	2 years 2 months 12 days	2 years 10 months 24 days	3 years 9 months 18 days
Exercisable	60,000	251,500	541,500
2003 Plan [Member] \| Maximum [Member]
Stock options outstanding
Outstanding Stock Options, Exercise price	18.80	18.80	18.80
Exercisable, Exercise price	18.80	18.80	18.80
2003 Plan [Member] \| Minimum [Member]
Stock options outstanding
Outstanding Stock Options, Exercise price	12.51	12.51	12.51
Exercisable, Exercise price	12.51	12.51	12.51
Inducements [Member]
Stock options outstanding
Outstanding stock options	0	80,000	124,000
Weighted Average Remaining Contractual Term		1 year 8 months 12 days	2 years 9 months 18 days
Exercisable		80,000	124,000
Inducements [Member] \| Maximum [Member]
Stock options outstanding
Outstanding Stock Options, Exercise price		14.32	14.32
Exercisable, Exercise price		14.32	14.32
Inducements [Member] \| Minimum [Member]
Stock options outstanding
Outstanding Stock Options, Exercise price		12.75	12.75
Exercisable, Exercise price		12.75	12.75

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii)

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(c), d(2)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(b)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

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

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(a)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

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- Definition

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+ References

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- Definition

Share based compensation shares stock option outstanding under plans exercise price.

+ References

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