Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2014

Debt Disclosure [Abstract]

Outstanding long-term debt and capital lease obligations

	September 30, 2014		December 31, 2013
Revolving Credit Facility	$	—	$	—
4.875% Senior Notes due 2021(1), effective interest rate of 4.967%	497,788		497,525
4.625% Senior Notes due 2021(2), effective interest rate of 4.648%	299,637		299,598
3.800% Senior Notes due 2022(3), effective interest rate of 3.845%	299,084		299,011
3.850% Senior Notes due 2023(4), effective interest rate of 3.851%	299,979		299,976
Capital leases	44		98
Total debt and capital lease obligations	1,396,532		1,396,208
Current portion of long-term debt	44		67
Long-term debt, less current portion	$	1,396,488	$	1,396,141

⁽¹⁾  Net of unamortized discount of $2.2 million as of September 30, 2014, and $2.5 million as of December 31, 2013.

⁽²⁾  Net of unamortized discount of $0.4 million as of September 30, 2014, and $0.4 million as of December 31, 2013.

⁽³⁾  Net of unamortized discount of $0.9 million as of September 30, 2014, and $1.0 million as of December 31, 2013.

⁽⁴⁾  Net of unamortized discount of less than $0.1 million as of September 30, 2014, and December 31, 2013.