Long-Term Debt (Tables)

6 Months Ended

Jun. 30, 2012

Carrying Amount of Components of Long-term Debt

The following table summarizes our long-term debt as of the dates presented:

	June 30, 2012			December 31, 2011
Revolving credit facility	$	180,000		$	99,000
Senior notes due 2016, net of discount (principal amount of $300,000)	294,144			293,561
Senior notes due 2019	300,000			300,000
Convertible notes due 2012, net of discount (principal amount of $4,915)	4,837			4,746
	778,981			697,307
Less: Current portion of long-term debt	(4,837		)	(4,746		)
	$	774,144		$	692,561

4.50% Convertible Notes due 2012

Carrying Amount of Components of Long-term Debt

The following table summarizes the carrying amount of the components of the Convertible Notes as of the dates presented: 

	June 30, 2012			December 31, 2011
Principal	$	4,915		$	4,915
Unamortized discount	(78		)	(169		)
Net carrying amount of liability component	$	4,837		$	4,746
Carrying amount of equity component	$	35,201		$	35,201

Components of Interest Expense Attributable to Convertible Notes

The following table summarizes the amounts recognized as components of interest expense attributable to the Convertible Notes for the periods presented:

	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Contractual interest expense	$	56	$	421	$	111	$	3,009
Accretion on original issue discount	46		318		91		2,265
Amortization of debt issuance costs	7		55		14		389
	$	109	$	794	$	216	$	5,663