|
Notes Payable (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 3 Months Ended | 3 Months Ended | 3 Months Ended | 3 Months Ended | 3 Months Ended | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Mar. 31, 2012
|
Mar. 31, 2011
|
Dec. 31, 2011
|
Mar. 31, 2012
Senior Subordinated Notes [Member]
Senior Notes, 6 Percent Due May 15, 2017 [Member]
|
Mar. 31, 2011
Senior Subordinated Notes [Member]
Senior Notes, 6 Percent Due May 15, 2017 [Member]
|
Dec. 31, 2011
Senior Subordinated Notes [Member]
Senior Notes, 6 Percent Due May 15, 2017 [Member]
|
Mar. 31, 2012
Senior Subordinated Notes [Member]
Senior Notes, 6 Percent Due November 30, 2015 [Member]
|
Mar. 31, 2011
Senior Subordinated Notes [Member]
Senior Notes, 6 Percent Due November 30, 2015 [Member]
|
Dec. 31, 2011
Senior Subordinated Notes [Member]
Senior Notes, 6 Percent Due November 30, 2015 [Member]
|
Mar. 31, 2012
Mortgage Note Payabe at Amortized Cost [Member]
|
Mar. 31, 2011
Mortgage Note Payabe at Amortized Cost [Member]
|
Dec. 31, 2011
Mortgage Note Payabe at Amortized Cost [Member]
|
Mar. 31, 2012
Notes Payable under Revolving Credit Agreement
|
Mar. 31, 2011
Notes Payable under Revolving Credit Agreement
|
Mar. 31, 2012
Notes Payable under Revolving Credit Agreement
2016 Credit Agreement [Member]
|
Mar. 07, 2012
Notes Payable under Revolving Credit Agreement
2016 Credit Agreement [Member]
|
Mar. 31, 2012
Notes Payable under Revolving Credit Agreement
Former Credit Agreement [Member]
|
Mar. 07, 2012
Notes Payable under Revolving Credit Agreement
Former Credit Agreement [Member]
|
Dec. 31, 2011
Notes Payable under Revolving Credit Agreement
Former Credit Agreement [Member]
|
|
| Debt Instrument [Line Items] | |||||||||||||||||||
| Notes Payable | $ 610.8 | $ 610.6 | $ 356.9 | $ 356.8 | $ 248.3 | $ 248.2 | $ 5.6 | $ 5.6 | |||||||||||
| Notes Payable, Interest Rate, Stated Percentage | 6.00% | 6.00% | |||||||||||||||||
| Line of Credit Facility, Maximum Borrowing Capacity | 325.0 | 245.0 | |||||||||||||||||
| Line of Credit Facility, Length of Agreement | 4 years | ||||||||||||||||||
| Line of Credit Facility, Remaining Borrowing Capacity | 325.0 | ||||||||||||||||||
| Line of Credit Facility, Amount Outstanding | 0 | 0 | 0 | ||||||||||||||||
| Write off of Deferred Debt Issuance Cost | 0.5 | ||||||||||||||||||
| Interest Expense before Capitalization of Interest | 10.5 | 9.9 | 5.5 | 5.5 | 3.9 | 3.8 | 0.1 | 0.1 | 1.0 | 0.5 | |||||||||
| Capitalization of Interest | (0.8) | (0.5) | |||||||||||||||||
| Interest Expense | 9.7 | 9.4 | |||||||||||||||||
| Interest Paid | $ 1.8 | $ 0.3 | $ 0.1 | $ 0.1 | $ 1.7 | $ 0.2 | |||||||||||||