|
Senior Unsecured Notes (Narrative) (Details) (USD $)
|
6 Months Ended |
|---|---|
|
Jun. 30, 2012
|
|
| Proceeds from the sale of Senior Unsecured Notes | $ 299,403,000 |
|
4.50% Senior Unsecured Notes, Due April 18, 2022 [Member]
|
|
| Face amount of Senior Unsecured Notes | 300,000,000 |
| Interest rate of Senior Unsecured Notes | 4.50% |
| Debt instrument, maturity date | Apr. 18, 2022 |
| Proceeds from the sale of Senior Unsecured Notes | $ 296,800,000 |
| X | ||||||||||
|
- Definition
The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Interest rate stated in the contractual debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|