Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2012

Carrying Amount of Components of Long-term Debt

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

	March 31,			December 31,
	2012			2011
Revolving credit facility	$	119,000		$	99,000
Senior notes due 2016, net of discount (principal amount of $300,000)		293,848			293,561
Senior notes due 2019		300,000			300,000
Convertible notes due 2012, net of discount (principal amount of $4,915)		4,791			4,746
		717,639			697,307
Less: Current portion of long-term debt		(4,791	)		(4,746	)
	$	712,848		$	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:

	March 31,			December 31,
	2012			2011
Principal	$	4,915		$	4,915
Unamortized discount		(124	)		(169	)
Net carrying amount of liability component	$	4,791		$	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 March 31,
	2012		2011
Contractual interest expense	$	55	$	2,588
Accretion on original issue discount		45		1,947
Amortization of debt issuance costs		7		334
	$	107	$	4,869