Supplemental Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Components of Supplemental Cash Flow Information
Fair value of warrant liability reclassified to additional paid-in-capital	$ 13,973
Value of common stock issued in payment of convertible notes		5,165
Property and equipment acquired through capital leases	873	365
Interest paid	2,950	4,732
Income taxes (refunded) paid, net	8,574	617
Preferred Stock Dividends [Member]
Components of Supplemental Cash Flow Information
Stock Issued During Period, Value, Stock Dividend		3,254
Term Loan Debt [Member]
Components of Supplemental Cash Flow Information
Value of common stock issued in payment of term loan debt		1,398
Conversion of Preferred Stock [Member]
Components of Supplemental Cash Flow Information
Value of preferred stock exchanged in conversion to common stock		$ 11,205