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Interest Rate Swap Agreements (Details Textual) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Jun. 30, 2012 Agreement | Jun. 30, 2011
Derivative [Line Items] |  |
Nominal amount of interest rate swap | $ 650,000 |
Interest Rate Swap Agreements (Textual) [Abstract] |  |
Number of interest rate swap agreements | 5 |
Changes in fair values are reclassified from accumulated other comprehensive loss into earnings | 6,263 | 7,945
Amortized interest expenses related to a previously terminated interest rate swap agreement | 1,976 | 2,259
Interest expense on interest rate swap agreement will amortize over the next twelve months | 494 |
Interest Rate Swap One Agreements [Member] |  |
Derivative [Line Items] |  |
Nominal amount of interest rate swap | 125,000 |
Interest Rate Swap One Agreements [Member] | Nondesignated [Member] |  |
Derivative [Line Items] |  |
Portion of interest rate swap not designated as hedge | 18,368 |
Interest Rate Swap Two Agreements [Member] |  |
Derivative [Line Items] |  |
Nominal amount of interest rate swap | 75,000 |
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 | 175,000 |
Interest Rate Swap Five Agreements [Member] |  |
Derivative [Line Items] |  |
Nominal amount of interest rate swap | $ 100,000 |

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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of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(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. + Details
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