Long-Term Debt (Tables)

6 Months Ended

Jun. 30, 2011

Long-Term Debt

Debt Amounts Included in Consolidated Balance Sheet

	June 30, 2011			December 31, 2010
Principal amount of convertible debentures	$	186,956		$	186,956
Unamortized debt discount		(24,024	)		(27,748	)
Carrying amount of convertible debentures	$	162,932		$	159,208
Additional paid in capital (net of tax)	$	31,310		$	31,310

Interest Expense

	Three months ended  June 30,				Six months ended  June 30,
	2011		2010		2011		2010
Cash interest expense	$	1,288	$	1,083	$	2,440	$	2,152
Non-cash amortization of debt discount		1,878		1,755		3,724		3,481
Amortization of debt costs		295		161		541		318
Total interest expense	$	3,461	$	2,999	$	6,705	$	5,951