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Senior Notes (Summary of Senior Notes) (Parenthetical) (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 27, 2017 | Jul. 31, 2016 | Jun. 30, 2018 | Dec. 31, 2017 | Oct. 31, 2017 | Dec. 31, 2015 | Jul. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  | 4.25% |  |  |  |
Long-term Debt |  |  | $ 1,015,455 | $ 1,014,940 |  |  |
Debt instrument, maturity date |  |  | Dec. 31, 2024 |  |  |  |
Senior notes 4.250% due 2024 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  | 4.25% |  |  |  | 4.25%
Long-term Debt |  |  |  |  |  |  | $ 300,000
Debt instrument, maturity date |  |  | Jul. 31, 2024 |  |  |  |
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] |  |  |  |  |  |  |
Stated interest rate |  |  | 3.50% |  |  | 3.50% |
Long-term Debt |  |  |  |  |  | $ 300,000 |
Debt instrument, maturity date |  |  | Dec. 31, 2020 |  |  |  |
Redemption price, percentage of principal amount |  |  | 100.00% |  |  |  |
Senior notes 5.20% due 2047 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  | 5.20% |  | 5.20% |  |
Long-term Debt |  |  |  |  | $ 200,000 |  |
Debt instrument, maturity date |  |  | Oct. 31, 2047 |  |  |  |
Redemption price, percentage of principal amount |  |  | 100.00% |  |  |  |
Additional issuance of long-term debt | $ 25,000 |  |  |  |  |  |

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