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Derivatives (Details) (USD $) | 12 Months Ended |  |  |  |  | 12 Months Ended
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Dec. 31, 2013 instrument | Dec. 31, 2012 | Dec. 31, 2011 | Jun. 30, 2011 Treasury Locks instrument | Sep. 30, 2007 Interest Rate Swap instrument | Apr. 30, 2013 Forward Swap instrument | Jun. 30, 2004 Forward Swap | Dec. 31, 2013 Reclassification out of Accumulated Other Comprehensive Income | Dec. 31, 2012 Reclassification out of Accumulated Other Comprehensive Income | Dec. 31, 2011 Reclassification out of Accumulated Other Comprehensive Income
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Number Of Interest Rate Derivatives Terminated |  |  |  | 2 | 2 | 4 |  |  |  |
Notional amount of interest rate hedges terminated |  |  |  | $ 150,000,000 | $ 100,000,000 | $ 240,000,000 | $ 94,000,000 |  |  |
Treasury locks designated as cash flow hedges, fair value |  |  |  | 5,300,000 | 3,260,000 | 3,156,000 |  |  |  |
Treasury locks designated as cash flow hedges, other comprehensive income |  |  |  | 5,218,000 | 3,228,000 | 3,141,000 | 4,148,000 |  |  |
Fair value of interest rate hedges recognized in other comprehensive income | 8,396,000 |  |  |  |  |  |  |  |  |
Interest expense | 85,283,000 | 83,192,000 | 75,532,000 |  |  |  |  | 438,000 | 231,000 | 9,000
Interest rate hedges gain (loss) to be reclassified into interest expense over next 12 months | $ 849,000 |  |  |  |  |  |  |  |  |
Number of Interest Rate Derivatives Held | 0 |  |  |  |  |  |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Number of interest rate derivative instruments terminated by the entity during the period. + References No definition available. + Details
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- Definition Fair value of all liability derivatives designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Net fair value of all derivative instruments designated as cash flow hedging instruments, which is ordinarily reflected within other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 + Details
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- Definition The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994 + Details
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- Definition Number of interest rate derivative instruments held by the entity at the reporting date. + References Reference 1: 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 Reference 2: 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 + Details
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