Financing (Tables)

3 Months Ended

Mar. 31, 2017

Debt Disclosure [Abstract]

Outstanding financing facilities

	March 31, 2017		December 31, 2016
Revolving Credit Facility, average interest rate of 4.000%	$	90,000	$	—
$500 million, 4.875% Senior Notes due 2021(1), effective interest rate of 4.959%	496,960		496,758
$300 million, 4.625% Senior Notes due 2021(2), effective interest rate of 4.646%	298,749		298,679
$300 million, 3.800% Senior Notes due 2022(3), effective interest rate of 3.845%	297,953		297,868
$300 million, 3.850% Senior Notes due 2023(4), effective interest rate of 3.851%	298,411		298,355
$500 million, 3.550% Senior Notes due 2026(5), effective interest rate of 3.570%	495,466		495,359
Long-term debt	$	1,977,539	$	1,887,019

⁽¹⁾  Net of unamortized discount of $1.3 million as of March 31, 2017, and $1.4 million as of December 31, 2016, and debt issuance costs of $1.7 million as of March 31, 2017, and $1.8 million as of December 31, 2016.

⁽²⁾  Net of unamortized discount of $0.2 million as of March 31, 2017, and December 31, 2016, and debt issuance costs of $1.0 million as of March 31, 2017, and $1.1 million as of December 31, 2016.

⁽³⁾  Net of unamortized discount of $0.7 million as of March 31, 2017, and December 31, 2016, and debt issuance costs of $1.4 million as of March 31, 2017, and $1.5 million as of December 31, 2016.

⁽⁴⁾  Net of unamortized discount of less than $0.1 million as of March 31, 2017, and December 31, 2016, and debt issuance costs of $1.6 million as of March 31, 2017, and December 31, 2016.

⁽⁵⁾  Net of unamortized discount of $0.8 million as of March 31, 2017, and December 31, 2016, and debt issuance costs of $3.8 million as of March 31, 2017, and $3.9 million as of December 31, 2016.