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Long-Term Debt Interest Rates (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 01, 2015 | Mar. 31, 2015 | Jun. 30, 2015 | Jun. 30, 2014 | Jan. 12, 2015 | Dec. 31, 2014 | Jan. 20, 2005
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of long-term debt |  |  | $ 1,331,648 | $ 3,016 |  |  |
1.875% Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unamortized discount |  |  | $ 5,630 |  |  | $ 6,605 |
Debt instrument, interest rate |  |  | 1.875% |  |  | 1.875% |
3.00% Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unamortized discount |  |  | $ 275 |  |  | $ 306 |
Debt instrument, interest rate |  |  | 3.00% |  |  | 3.00% |
4.15% Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unamortized discount |  |  | $ 1,366 |  |  | $ 1,439 |
Debt instrument, interest rate |  |  | 4.15% |  |  | 4.15% |
4.50% Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unamortized discount |  |  | $ 1,714 |  |  | $ 1,871 |
Debt instrument, interest rate |  |  | 4.50% |  |  | 4.50% |
4.625% Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, interest rate |  |  | 4.625% |  | 4.625% |  |
Unamortized Premium |  |  | $ 40,203 |  | $ 43,700 |  |
5.10% Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unamortized discount |  |  |  |  |  | $ 3 |
Debt instrument, interest rate |  |  |  |  |  | 5.10% | 5.10%
Repayments of long-term debt | $ 325,000 |  |  |  |  |  |
5.45% Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unamortized discount |  |  | $ 1,012 |  |  | $ 1,029 |
Debt instrument, interest rate |  |  | 5.45% |  |  | 5.45% |
Senior Unsecured Cash Bridge Facility | Bridge Loan |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of long-term debt |  | $ 800,000 |  |  |  |  |
Short-term Debt | Term Loan |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of long-term debt |  | 1,000,000 |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of long-term debt |  | $ 250,000 |  |  |  |  |

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