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

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Long-Term Debt Interest Rates (Details) - USD ($)	6 Months Ended
Long-Term Debt Interest Rates (Details) - USD ($)	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Debt Instrument [Line Items]
Repayments of long-term debt	$ 382,162,000	$ 1,331,648,000
September 2015 Term Loan Agreement
Debt Instrument [Line Items]
Unamortized debt issuance costs	2,212,000		$ 2,833,000
364 Day Facility
Debt Instrument [Line Items]
Repayments of long-term debt	300,000,000.0
1.875% Senior Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	$ 9,122,000		$ 9,904,000
Debt instrument, interest rate	1.875%		1.875%
3.00% Senior Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	$ 1,506,000		$ 1,726,000
Debt instrument, interest rate	3.00%		3.00%
4.15% Senior Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	$ 4,103,000		$ 4,346,000
Debt instrument, interest rate	4.15%		4.15%
4.50% Senior Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	$ 2,681,000		$ 2,982,000
Debt instrument, interest rate	4.50%		4.50%
5.45% Senior Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	$ 4,390,000		$ 4,468,000
Debt instrument, interest rate	5.45%		5.45%