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Derivative Instruments (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 03, 2011 | Dec. 31, 2011 | Sep. 30, 2011 | Jul. 31, 2011 | Dec. 31, 2010 | Apr. 30, 2010 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 09, 2011 | Sep. 29, 2011 | Jul. 12, 2011 | Dec. 06, 2010 | Apr. 15, 2010
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate contract with notional amount |  |  |  |  |  |  |  |  |  |  | $ 350,000 |  |  |
Future amortization interest expense over 10 year periods |  |  |  |  |  |  | $ 1,295 | $ 1,612 | $ 1,723 |  |  |  |  |
Interest rate exchange agreement expiration date |  |  | Feb. 28, 2012 |  |  |  |  |  |  |  |  |  |  |
Additional interest rate contract settlement |  | $ 4,000 |  |  |  |  |  |  |  |  |  |  |  |
Expense reclassified into interest expense for interest rate contracts |  |  |  |  |  |  | 6,900 | $ 7,000 | $ 7,200 |  |  |  |  |
Amount to be recognized from hedged transactions within 12 months, approximate |  |  |  |  |  |  | $ 6,700 |  |  |  |  |  |  |
4.2% Senior Notes, due December 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  |  | 4.20% |  |  | 4.20% |  |  |  |
4.5% Senior Notes, due December 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  |  | 4.50% |  |  |  |  |  | 4.50% |
Interest Rate Exchange Agreement Expiring 2010 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate contract with notional amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000
Interest rate contract settlement amount |  |  |  |  | $ 31,000 |  |  |  |  |  |  |  |  |
Future amortization interest expense over 10 year periods |  |  |  |  | $ 31,000 |  |  |  |  |  |  |  |  |
Term of amortized interest expense, years |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  | 5.80% |  |  |  |  |
Interest rate exchange agreement expiration date |  |  |  |  |  | Dec. 31, 2010 |  |  |  |  |  |  |  |
Interest Rate Exchange Agreement Expiring 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate contract with notional amount |  |  |  |  |  |  |  |  |  |  |  | $ 350,000 |  |
Interest rate contract settlement amount | $ 34,700 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate exchange agreement expiration date |  |  |  | Sep. 30, 2011 |  |  |  |  |  |  |  |  |  |
Interest Rate Exchange Agreements Expiring 2011 And 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future amortization interest expense over 10 year periods |  | 37,900 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 5.30% |  |  |  |  |  |
Settlement amount interest rate contract |  |  |  |  |  |  |  | $ 38,700 |  |  |  |  |  |
Interest rate settlement recognized as other expense |  | $ 800 |  |  |  |  |  |  |  |  |  |  |  |

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