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Debt (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |
Notes Payable | $ 751,300,000 |  | $ 751,300,000 |  | $ 750,600,000
Net Proceeds from Issuances of Debt |  |  | 10,000,000 | $ 288,800,000 |
Interest Expense before Capitalization of Interest | 11,300,000 | $ 11,400,000 | 33,900,000 | 36,000,000 |
Capitalization of Interest | (200,000) | (100,000) | (500,000) | (600,000) |
Interest Expense | 11,100,000 | 11,300,000 | 33,400,000 | 35,400,000 |
Interest Paid | 8,500,000 | 8,200,000 | 30,500,000 | 30,400,000 |
Senior Notes [Member] | Senior Notes, 6 Percent Due November 30, 2015 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Expense before Capitalization of Interest | 0 | 0 | 0 | 3,700,000 |
Interest Paid | 0 | 0 | 0 | 4,800,000 |
Senior Notes [Member] | Senior Notes, 6 Percent Due May 15, 2017 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes Payable | $ 359,600,000 |  | $ 359,600,000 |  | 359,100,000
Notes Payable, Interest Rate, Stated Percentage | 6.00% |  | 6.00% |  |
Interest Expense before Capitalization of Interest | $ 5,600,000 | 5,600,000 | $ 16,700,000 | 16,700,000 |
Interest Paid | 0 | 0 | 10,800,000 | 10,800,000 |
Senior Notes [Member] | Senior Notes, 4.35 Percent Due February 15, 2025 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes Payable | $ 247,600,000 |  | $ 247,600,000 |  | 247,400,000
Notes Payable, Interest Rate, Stated Percentage | 4.35% |  | 4.35% |  |
Interest Expense before Capitalization of Interest | $ 2,700,000 | 2,800,000 | $ 8,300,000 | 6,700,000 |
Interest Paid | 5,500,000 | 5,200,000 | 10,900,000 | 5,200,000 |
Subordinated Debt [Member] | Subordinated Debenture, 7.375 Percent Due 2054 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes Payable | $ 144,100,000 |  | $ 144,100,000 |  | 144,100,000
Notes Payable, Interest Rate, Stated Percentage | 7.375% |  | 7.375% |  |
Interest Expense before Capitalization of Interest | $ 2,800,000 | 2,800,000 | $ 8,300,000 | 8,300,000 |
Interest Paid | 2,800,000 | 2,800,000 | 8,300,000 | 8,300,000 |
Notes Payable under Revolving Credit Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Amount Outstanding | 0 |  | 0 |  | 0
Revolving Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 225,000,000 |  | 225,000,000 |  | 225,000,000
Interest Expense before Capitalization of Interest | 200,000 | 200,000 | 600,000 | 600,000 |
Interest Paid | 200,000 | 200,000 | 500,000 | 1,300,000 |
Federal Home Loan Bank of Dallas [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Net Proceeds from Issuances of Debt |  |  | 10,000,000 | 20,500,000 |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Repayment and Penalties |  |  | 10,000,000 | 20,500,000 |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances | 0 |  | 0 |  | 0
Interest Expense before Capitalization of Interest | 0 | 0 | 0 | 0 |
Interest Paid | 0 | 0 | 0 | 0 |
Federal Home Loan Bank of Chicago [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Net Proceeds from Issuances of Debt |  |  |  | 21,000,000 |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Repayment and Penalties |  |  |  | 21,000,000 |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances | 0 |  | 0 |  | $ 0
Interest Expense before Capitalization of Interest | 0 | 0 | 0 | 0 |
Interest Paid | $ 0 | $ 0 | $ 0 | $ 0 |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of Federal Home Loan Bank (FHLBank) advances to member financial institutions. + References No definition available. + Details
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- Definition Amount of repayments and penalties incurred in the satisfaction or roll-over of Federal Home Loan Bank (FHLB) advance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Total interest costs incurred during the period and either capitalized or charged against earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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- Definition Amount of interest capitalized, including amount of allowance for funds used during construction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 835 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501662&loc=d3e56162-110433 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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 3: 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 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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 + Details
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