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Summary of Significant Accounting Policies (Fair Value Measurements/ Accounting for Derivative Instruments and Hedge Activities) (Details) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2009 | Dec. 31, 2011 | Dec. 31, 2010
Assets: |  |  |
Available-for-Sale Securities |  | $ 0 | $ 248,000
Liabilities: |  |  |
Interest Rate Swaps |  | 3,886,000 |
Derivative Instrument and Hedging Activites |  |  |
Gain on fair value hedge ineffectiveness | 100,000 |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Assets: |  |  |
Available-for-Sale Securities |  | 0 | 248,000
Liabilities: |  |  |
Interest Rate Swaps |  | 0 |
Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets: |  |  |
Available-for-Sale Securities |  | 0 | 0
Liabilities: |  |  |
Interest Rate Swaps |  | 3,886,000 |
Unobservable Inputs (Level 3) [Member] |  |  |
Assets: |  |  |
Available-for-Sale Securities |  | 0 | 0
Liabilities: |  |  |
Interest Rate Swaps |  | 0 |
Interest Rate Swap [Member] |  |  |
Derivative Instrument and Hedging Activites |  |  |
Number of interest rate derivatives held | 2 |  |
Fair value adjustment of the hedge charged to expenses | $ (1,100,000) |  |

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- Definition Decrease in the fair value of the derivative or group of derivatives included in earnings in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5618551-113959 + Details
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- Definition Gain recognized in earnings during the reporting period representing the amount of the fair value hedges' ineffectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph 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. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 1 -Subparagraph a, f, g Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6956420&loc=d3e24584-111560 + Details
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