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Derivative Instruments (Narrative) (Details) (USD $) | 0 Months Ended | 1 Months Ended | 12 Months Ended |  |  | 1 Months Ended |  | 0 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 29, 2011 | Apr. 15, 2010 | Dec. 31, 2011 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Jul. 12, 2011 | May 31, 2011 | Dec. 31, 2011 4.2% Senior Notes, Due December 2021 [Member] years | Dec. 09, 2011 4.2% Senior Notes, Due December 2021 [Member] | Apr. 15, 2010 4.5 % Senior Notes [Member] years | Dec. 31, 2011 4.5 % Senior Notes [Member] | Dec. 06, 2010 4.5 % Senior Notes [Member]
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate contract with notional amount | $ 350,000,000 | $ 300,000,000 |  |  |  |  | $ 350,000,000 |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 4.20% | 4.20% | 4.50% | 4.50% | 4.50%
Interest rate contract settlement | 34,700,000 | 31,000,000 | 38,700,000 |  |  |  |  |  |  |  |  |  |
Interest rate contract settlement term |  |  |  |  |  |  |  |  | 10 |  | 10 |  |
Interest rate contract settlement, interest rate, effective percentage |  |  |  |  |  |  |  |  | 5.30% |  | 5.80% |  |
Additional interest rate contract settlement |  |  | 4,000,000 |  |  |  |  |  |  |  |  |  |
Recognized as other expense |  |  | 800,000 |  |  |  |  |  |  |  |  |  |
Interest expense |  |  | 37,900,000 | 29,332,000 | 16,150,000 | 17,178,000 |  |  |  |  |  |  |
Notional amount foreign currency exchange contracts |  |  |  |  |  |  |  | 500,000 |  |  |  |  |
Accumulated other comprehensive income loss from shareholders' equity |  |  | $ 7,600,000 | $ 7,600,000 |  |  |  |  |  |  |  |  |

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