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Debt Summary of Debt (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 05, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 2,356,984 |  | $ 2,547,845
Less current portion | 6,500 |  | 39,000
Long-term debt | 2,350,484 |  | 2,508,845
Weighted-average interest rate | 3.56% |  | 3.08%
Line of Credit |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 0 |  | 0
Stated interest rate | 0.00% |  | 0.00%
Credit facility, expiration date | Oct. 18, 2018 |  |
Five-Year Term Loan, due October 2018 | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 65,000 |  | 650,000
Stated interest rate | 1.53% |  | 1.54%
Debt instrument, maturity date | Oct. 18, 2018 |  |
Seven-Year Term Loan, due October 2020 | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 645,125 |  | 650,000
Stated interest rate | 1.78% |  | 1.79%
Debt instrument, maturity date | Oct. 18, 2020 |  |
6.50% Senior Notes, due March 2018 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 149,978 |  | 149,974
Stated interest rate | 6.50% |  | 6.50%
Debt instrument, maturity date | Mar. 15, 2018 |  |
Senior notes, discount | 22 |  | 26
3.90% Senior Notes, due June 2022 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 399,725 |  | 399,698
Stated interest rate | 3.90% |  | 3.90%
Debt instrument, maturity date | Jun. 15, 2022 |  |
Senior notes, discount | 275 |  | 302
4.50% Senior Notes, due November 2023 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 698,286 |  | 698,173
Stated interest rate | 4.50% |  | 4.50%
Debt instrument, maturity date | Nov. 01, 2023 |  |
Senior notes, discount | 1,714 |  | 1,827
3.65% Senior Notes, due September 2024 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 398,870 |  | 0
Stated interest rate | 3.65% | 3.65% | 0.00%
Debt instrument, maturity date | Sep. 15, 2024 |  |
Senior notes, discount | $ 1,130 |  |
Current Portion of Long-term Debt |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 1.78% |  | 1.59%
Long-term Debt, Excluding Current Portion |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average interest rate | 3.56% |  | 3.10%

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