Financing (Tables)

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Outstanding financing facilities

	December 31,
	2015		2014 (1)
Revolving Credit Facility	$	—	$	—
$500 million, 4.875% Senior Notes due 2021 (2), effective interest rate of 4.963%	495,951		495,144
$300 million, 4.625% Senior Notes due 2021 (3), effective interest rate of 4.647%	298,396		298,113
$300 million, 3.800% Senior Notes due 2022 (4), effective interest rate of 3.845%	297,535		297,215
$300 million, 3.850% Senior Notes due 2023 (5), effective interest rate of 3.851%	$	298,136	$	297,925

⁽¹⁾  Prior period amounts have been reclassified to conform to current period presentation, due to the Company's adoption of new accounting standards during the fourth quarter ended December 31, 2015, see Note 1 for further information.

⁽²⁾  Net of unamortized discount of $1.8 million and $2.1 million as of December 31, 2015 and 2014, respectively, and debt issuance costs of $2.3 million and $2.7 million as of December 31, 2015 and 2014, respectively.

⁽³⁾  Net of unamortized discount of $0.3 million and $0.4 million as of December 31, 2015 and 2014, respectively, and debt issuance costs of $1.3 million and $1.5 million as of December 31, 2015 and 2014, respectively.

⁽⁴⁾  Net of unamortized discount of $0.8 million and $0.9 million as of December 31, 2015 and 2014, respectively, and debt issuance costs of $1.7 million and $1.9 million as of December 31, 2015 and 2014, respectively.

⁽⁵⁾  Net of unamortized discount of less than $0.1 million as of December 31, 2015 and 2014, and debt issuance costs of $1.8 million and $2.1 million as of December 31, 2015 and 2014, respectively.