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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%

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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