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Notes Payable (Details) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Debt Instrument [Line Items] |  |  |  |  |
Notes Payable | $ 606,700,000 |  | $ 606,700,000 |  | $ 611,400,000
Interest Expense before Capitalization of Interest | 9,700,000 | 9,800,000 | 29,300,000 | 30,100,000 |
Capitalization of Interest | (200,000) | (200,000) | (700,000) | (1,600,000) |
Interest Expense | 9,500,000 | 9,600,000 | 28,600,000 | 28,500,000 |
Interest Paid | 500,000 | 300,000 | 19,200,000 | 20,500,000 |
Notes Payable under Revolving Credit Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Expense before Capitalization of Interest | 300,000 | 300,000 | 900,000 | 1,600,000 |
Interest Paid | 400,000 | 200,000 | 600,000 | 1,900,000 |
Notes Payable under Revolving Credit Agreement [Member] | 2016 Credit Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Length of Agreement |  |  | 4 years |  |
Line of Credit Facility, Maximum Borrowing Capacity | 325,000,000 |  | 325,000,000 |  |
Line of Credit Facility, Amount Outstanding | 0 |  | 0 |  | 0
Line of Credit Facility, Remaining Borrowing Capacity | 325,000,000 |  | 325,000,000 |  | 325,000,000
Senior Subordinated Notes [Member] | Senior Notes, 6 Percent Due May 15, 2017 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes Payable | 357,800,000 |  | 357,800,000 |  | 357,300,000
Notes Payable, Interest Rate, Stated Percentage | 6.00% |  | 6.00% |  |
Interest Expense before Capitalization of Interest | 5,500,000 | 5,500,000 | 16,600,000 | 16,600,000 |
Interest Paid | 0 | 0 | 10,800,000 | 10,800,000 |
Senior Subordinated Notes [Member] | Senior Notes, 6 Percent Due November 30, 2015 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes Payable | 248,900,000 |  | 248,900,000 |  | 248,600,000
Notes Payable, Interest Rate, Stated Percentage | 6.00% |  | 6.00% |  |
Interest Expense before Capitalization of Interest | 3,900,000 | 3,900,000 | 11,600,000 | 11,600,000 |
Interest Paid | 0 | 0 | 7,500,000 | 7,500,000 |
Mortgage Note Payabe at Amortized Cost [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes Payable | 0 |  | 0 |  | 5,500,000
Interest Expense before Capitalization of Interest | 0 | 100,000 | 200,000 | 300,000 |
Interest Paid | $ 100,000 | $ 100,000 | $ 300,000 | $ 300,000 |

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