Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments

The fair values and carrying values of our debt instruments are detailed as follows:

	December 31, 2015			December 31, 2014
	Fair Value		Carrying Value	Fair Value	Carrying Value
3.85% senior notes, payable February 1, 2023; interest payable semiannually	$	584,730	600,000	603,180	600,000
6.125% notes, payable January 15, 2016; interest payable semiannually	646,130		645,555	677,833	645,555
2.00% senior notes, payable January 14, 2022; interest payable annually	554,209		546,627	—	—
Commercial paper	756,867		756,867	301,600	301,600
Five-year senior secured credit facility, due March 26, 2020	134,075		134,075	195,665	195,665
Securitization facility	500,000		500,000	500,000	500,000
Capital leases and other	16,805		16,807	10,620	10,620
Total debt	3,192,816		3,199,931	2,288,898	2,253,440
Less current portion of long term debt and commercial paper	2,003,578		2,003,003	851,305	851,305
Long-term debt, less current portion	$	1,189,238	1,196,928	1,437,593	1,402,135

Schedule of Maturities of Long-term Debt

The aggregate maturities of long-term debt as of December 31, 2015 are as follows:

2016	$	1,999,161
2017	1,875
2018	1,650
2019	1,546
2020	43,161
Thereafter	1,152,538
	$	3,199,931