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Debt (Details) (USD $) | 0 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Feb. 27, 2014 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |  |  |  |
Notes Payable |  | $ 751,700,000 |  | $ 751,700,000 |  | $ 606,900,000
Interest Expense before Capitalization of Interest |  | 12,400,000 | 9,800,000 | 23,000,000 | 19,600,000 |
Capitalization of Interest |  | (200,000) | (200,000) | (500,000) | (500,000) |
Interest Expense |  | 12,200,000 | 9,600,000 | 22,500,000 | 19,100,000 |
Interest Paid |  | 21,200,000 | 18,600,000 | 21,400,000 | 18,700,000 |
Senior Notes [Member] | Senior Notes, 6 Percent Due May 15, 2017 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notes Payable |  | 358,200,000 |  | 358,200,000 |  | 357,900,000
Notes Payable, Interest Rate, Stated Percentage |  | 6.00% |  | 6.00% |  |
Interest Expense before Capitalization of Interest |  | 5,600,000 | 5,600,000 | 11,100,000 | 11,100,000 |
Interest Paid |  | 10,800,000 | 10,800,000 | 10,800,000 | 10,800,000 |
Senior Notes [Member] | Senior Notes, 6 Percent Due November 30, 2015 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notes Payable |  | 249,300,000 |  | 249,300,000 |  | 249,000,000
Notes Payable, Interest Rate, Stated Percentage |  | 6.00% |  | 6.00% |  |
Interest Expense before Capitalization of Interest |  | 3,800,000 | 3,800,000 | 7,700,000 | 7,700,000 |
Interest Paid |  | 7,500,000 | 7,500,000 | 7,500,000 | 7,500,000 |
Subordinated Debt [Member] | Subordinated Debenture, 7.375 Percent Due 2054 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notes Payable |  | 144,200,000 |  | 144,200,000 |  | 0
Notes Payable, Interest Rate, Stated Percentage |  | 7.375% |  | 7.375% |  |
Interest Expense before Capitalization of Interest |  | 2,800,000 | 0 | 3,800,000 | 0 |
Interest Paid |  | 2,800,000 | 0 | 2,800,000 | 0 |
Debt Instrument, Face Amount | 150,000,000 |  |  |  |  |
Proceeds from Debt, Net of Issuance Costs | 144,200,000 |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 7.69% |  |  |  |  |
Notes Payable under Revolving Credit Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest Expense before Capitalization of Interest |  | 200,000 | 300,000 | 400,000 | 600,000 |
Interest Paid |  | 100,000 | 200,000 | 300,000 | 200,000 |
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 |  | 225,000,000 |  | 225,000,000 |  |
Line of Credit Facility, Amount Outstanding |  | 0 |  | 0 |  | 0
Mortgage Note Payabe at Amortized Cost [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest Expense before Capitalization of Interest |  | 0 | 100,000 | 0 | 200,000 |
Interest Paid |  | $ 0 | $ 100,000 | $ 0 | $ 200,000 |

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- Definition Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13, 16 -Article 9 + Details
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