Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2013

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

	September 30, 2013		December 31, 2012
Principal amount of convertible debentures	$	186,956	$	186,956
Unamortized debt discount		(5,616)		(12,066)
Carrying amount of convertible debentures	$	181,340	$	174,890
Additional paid in capital (net of tax)	$	31,310	$	31,310

Interest Expense Included In Consolidated Income Statement

	Three months ended September 30,				Nine months ended September 30,
	2013		2012		2013		2012
Cash interest expense	$	990	$	1,381	$	3,420	$	4,064
Non-cash amortization of debt discount		2,186		2,043		6,450		6,028
Amortization and write-off of debt costs		324		319		1,421		940
Total interest expense	$	3,500	$	3,743	$	11,291	$	11,032