Long-Term Debt (Tables)

6 Months Ended

Jun. 30, 2015

Debt Disclosure [Abstract]

Outstanding long-term debt and capital lease obligations

	June 30, 2015		December 31, 2014
Revolving Credit Facility	$	—	$	—
4.875% Senior Notes due 2021(1), effective interest rate of 4.965%	498,052		497,876
4.625% Senior Notes due 2021(2), effective interest rate of 4.647%	299,676		299,650
3.800% Senior Notes due 2022(3), effective interest rate of 3.845%	299,160		299,109
3.850% Senior Notes due 2023(4), effective interest rate of 3.851%	299,980		299,980
Capital leases	—		25
Total debt and capital lease obligations	1,396,868		1,396,640
Current portion of long-term debt	—		25
Long-term debt, less current portion	$	1,396,868	$	1,396,615

⁽¹⁾  Net of unamortized discount of $1.9 million as of June 30, 2015, and $2.1 million as of December 31, 2014.

⁽²⁾  Net of unamortized discount of $0.3 million as of June 30, 2015, and $0.4 million as of December 31, 2014.

⁽³⁾  Net of unamortized discount of $0.8 million as of June 30, 2015, and $0.9 millionDecember 31, 2014.

⁽⁴⁾  Net of unamortized discount of less than $0.1 million as of June 30, 2015, and December 31, 2014.