Financing (Tables)

12 Months Ended

Dec. 31, 2014

Debt Disclosure [Abstract]

Outstanding financing facilities

	December 31,
	2014		2013
Revolving Credit Facility	$	—	$	—
4.875% Senior Notes due 2021 (1), effective interest rate of 4.966%	497,876		497,525
4.625% Senior Notes due 2021 (2), effective interest rate of 4.648%	299,650		299,598
3.800% Senior Notes due 2022 (3), effective interest rate of 3.845%	299,109		299,011
3.850% Senior Notes due 2023 (4), effective interest rate of 3.851%	$	299,980	$	299,976

⁽¹⁾  Net of unamortized discount of $2.1 million and $2.5 million as of December 31, 2014 and 2013, respectively.

⁽²⁾  Net of unamortized discount of $0.4 million as of December 31, 2014 and 2013.

⁽³⁾  Net of unamortized discount of $0.9 million and $1.0 million as of December 31, 2014 and 2013, respectively.

⁽⁴⁾  Net of unamortized discount of less than $0.1 million as of December 31, 2014 and 2013.