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Derivative Financial Instruments (Details Textual) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
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Dec. 31, 2012 | Dec. 31, 2011
Derivative Financial Instruments (Textual) [Abstract] |  |
LIBOR period | 3 months |
Weighted average fixed rate | 6.14% |
Notional amount of interest | $ 30.5 | $ 30.5
Recorded period of effectiveness of cash flow hedges on net income | 12 months |
Recorded period of effectiveness of fair value hedges on net income | 12 months |
Notional amounts of the loan agreements | $ 81.0 | $ 52.2
Recorded period of effectiveness of fair value of derivatives on net income | 12 months |
Interest rate swap agreement, reckoning period for swaption | monthly |

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- Definition Derivative interest rate contract frequency of swaption. + References No definition available. + Details
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- Definition Aggregate notional amount of all interest rate derivatives designated as hedging instruments in cash flow hedges. Notional amount refers to the monetary amount specified in the interest rate derivative contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 + Details
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