Debt (Tables)

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

		December 31,
	Interest rate	2015		2014
Commercial paper	1.1%	$	90,000	$	—
Notes due March 2015	5.0%	—		274,879
Notes due January 2016	4.75%	370,914		370,914
Notes due September 2017	5.75%	385,109		385,109
Notes due March 2018	5.6%	250,000		250,000
Notes due May 2018	4.75%	350,000		350,000
Notes due March 2019	6.25%	300,000		300,000
Notes due November 2022	5.25%	—		110,000
Notes due March 2024	4.625%	500,000		500,000
Notes due January 2037	5.25%	115,041		115,041
Notes due March 2043	6.7%	425,000		425,000
Term loans	Variable	150,000		130,000
Other debt		15,758		16,000
Principal amount		2,951,822		3,226,943
Less: unamortized discount		5,288		6,653
Plus: unamortized interest rate swap proceeds		22,463		31,716
Total debt		2,968,997		3,252,006
Less: current portion long-term debt		461,085		324,879
Long-term debt		$	2,507,912	$	2,927,127

Schedule of Maturities of Long-term Debt

Annual maturities of outstanding debt at December 31, 2015 are as follows:

2016	$	461,085
2017	535,277
2018	600,168
2019	300,168
2020	412
Thereafter	1,054,712
Total	$	2,951,822