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Senior Notes (Schedule Of Corporate Debt) (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Jul. 31, 2014 | Dec. 31, 2012
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, gross |  |  | $ 800,000 | $ 750,000 |  |
Debt issuance costs, net |  |  | (4,109) | (9,864) |  |
Long-term Debt |  |  | $ 795,891 | 740,136 |  |
Stated interest rate |  |  | 4.25% |  |  |
Debt instrument, maturity date |  |  | Dec. 31, 2024 |  |  |
Senior notes 4.250% due 2024 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, gross | [1] |  | $ 500,000 | 300,000 |  |
Long-term Debt |  |  |  |  | $ 300,000 |
Stated interest rate |  |  | 4.25% |  | 4.25% |
Due date |  |  | 2024 |  |  |
Debt instrument, maturity date |  |  | Jul. 31, 2014 |  |  |
Redemption price, percentage of principal amount |  |  | 100.00% |  |  |
Additional issuance of long-term debt |  | $ 200,000 |  |  |  |
Senior notes 3.50% due 2020 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, gross | [2] |  | $ 300,000 | 300,000 |  |
Long-term Debt |  |  |  | $ 300,000 |  |
Stated interest rate |  |  | 3.50% | 3.50% |  |
Due date |  |  | 2020 |  |  |
Debt instrument, maturity date |  |  | Dec. 31, 2015 |  |  |
Redemption price, percentage of principal amount |  |  | 100.00% |  |  |
Senior notes 5.375%, due 2022 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, gross | [3] |  |  | $ 150,000 |  |
Long-term Debt |  |  |  |  |  | $ 150,000
Stated interest rate |  |  | 5.375% |  |  | 5.375%
Due date |  |  | 2022 |  |  |
Debt instrument, maturity date |  |  | Dec. 31, 2012 |  |  |
[1] | In July 2014, we sold in a registered underwritten public offering, $300.0 million in aggregate principal amount of 4.250% senior notes due July 2024. Interest on these senior notes is payable semi-annually in arrears. We may redeem the notes in whole or in part, at our option, at a redemption price equal to 100% of their principal amount, plus a “make-whole” premium and accrued and unpaid interest, if any, to the date of redemption. In July 2016, we issued an additional $200.0 million in aggregate principal amount of 4.25% senior notes due 2024.
[2] | In December 2015, we sold in a registered underwritten public offering, $300.0 million in aggregate principal amount of 3.50% senior notes due December 2020. Interest on these senior notes is payable semi-annually in arrears. We may redeem the notes in whole or in part, at our option, at a redemption price equal to 100% of their principal amount, plus a “make-whole” premium and accrued and unpaid interest, if any, to the date of redemption.
[3] | In December 2012, we sold in a registered underwritten public offering, $150.0 million in aggregate principal amount of 5.375% senior notes due December 2022. Interest on these senior notes was payable quarterly in arrears. The notes were redeemed in August 2016.

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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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