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Derivatives (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 2011 Interest Rate Swap | Dec. 31, 2012 2011 Interest Rate Swap | Mar. 31, 2012 2011 Interest Rate Swap | Mar. 31, 2013 2006 Interest Rate Swap | Mar. 31, 2013 2009 Interest Rate Swap
Derivative [Line Items] |  |  |  |  |  |  |
Notional amount of interest rate derivatives |  |  | $ 93,500 | $ 93,500 | $ 93,500 |  |
Fixed rate payments, interest rate |  |  | 5.50% |  |  |  |
Variable rate payment rate |  |  | 1.75% |  |  | 1.75% | 1.75%
Fair value of collateral pledged to secure interest rate contracts | 9,656 |  |  |  |  |  |
Incremental interest expense paid to interest rate swap counterparties | $ 813 | $ 749 |  |  |  |  |

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- Definition Fair value of collateral pledged to secure interest rate contracts + References No definition available. + Details
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- Definition Incremental interest expense paid to interest rate swap counterparties + References No definition available. + Details
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- Definition The percentage points added to the reference rate to compute the variable rate on the interest rate derivative. + References No definition available. + Details
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- 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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