Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2012

Long-Term Debt [Abstract]

Financial Debt Covenants

Description	Requirement
Leverage Ratio (Consolidated Indebtedness/Consolidated  Adj. EBITDA)	< 3.50 to 1.00
Fixed Charge Coverage Ratio (Consolidated Free Cash Flow/Consolidated Fixed Charges)	> 1.50 to 1.00
Annual Operating Lease Commitment	< $30.0 million

Debt Amounts Included In Consolidated Balance Sheet

	March 31, 2012			December 31, 2011
Principal amount of convertible debentures	$	186,956		$	186,956
Unamortized debt discount		(18,197	)		(20,172	)
Carrying amount of convertible debentures	$	168,759		$	166,784
Additional paid in capital (net of tax)	$	31,310		$	31,310

Interest Expense Included In Consolidated Income Statement

	Three months ended  March 31,
	2012		2011
Cash interest expense	$	1,334	$	1,152
Non-cash amortization of debt discount		1,975		1,846
Amortization of debt costs		308		246
Total interest expense	$	3,617	$	3,244