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Interest Rate Swap Agreements (Details Textual) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Sep. 30, 2012 Agreement | Sep. 30, 2011
Derivative [Line Items] |  |
Nominal amount of interest rate swap | $ 525,000 |
Interest Rate Swap Agreements (Textual) [Abstract] |  |
Number of interest rate swap agreements | 4 |
Changes in fair values are reclassified from accumulated other comprehensive loss into earnings | 11,184 | 12,047
Amortized interest expenses related to a previously terminated interest rate swap agreement | 2,470 | 3,248
Interest Rate Swap One Agreements [Member] |  |
Derivative [Line Items] |  |
Nominal amount of interest rate swap | 75,000 |
Interest Rate Swap Two Agreements [Member] |  |
Derivative [Line Items] |  |
Nominal amount of interest rate swap | 175,000 |
Interest Rate Swap Two Agreements [Member] | Nondesignated [Member] |  |
Derivative [Line Items] |  |
Portion of interest rate swap not designated as hedge | 11,017 |
Interest Rate Swap Three Agreements [Member] |  |
Derivative [Line Items] |  |
Nominal amount of interest rate swap | 175,000 |
Interest Rate Swap Four Agreements [Member] |  |
Derivative [Line Items] |  |
Nominal amount of interest rate swap | $ 100,000 |

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- Definition Nominal amount of interest rate swap agreement. + References No definition available. + Details
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- Definition Portion of interest rate swap not designated as hedge. + References No definition available. + Details
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- Definition The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings. + 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 (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + 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 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 -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 + Details
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