Supplemental Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 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
Equipment acquired through capital leases	1,072	1,149
Interest Paid	4,357	7,567
Income taxes paid	12,158	1,070
Preferred Stock Dividends [Member]
Components of Supplemental Cash Flow Information
Value of common stock issued in payment of preferred stock dividends		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
Fair value exchanged in conversion of preferred stock to common stock		$ 11,205