DEBT - Summary of Our Debt and Capital Leases (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term debt	$ 95,570	$ 63,459
Less: current maturities	1,879	1,861
Total long-term debt	93,691	61,598
Senior secured credit facility due 2015
Debt Instrument [Line Items]
Long-term debt	25,371	13,300
Senior secured notes due 2015
Debt Instrument [Line Items]
Long-term debt	61,113	0
Convertible notes due 2015
Debt Instrument [Line Items]
Long-term debt	5,528	46,142
Notes payable and other financing
Debt Instrument [Line Items]
Long-term debt	$ 3,558	$ 4,017