DEBT - Summary of Our Debt and Capital Leases (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term debt	$ 90,796	$ 63,459
Less: current maturities	1,898	1,861
Total long-term debt	88,898	61,598
Senior secured credit facility due 2015
Debt Instrument [Line Items]
Long-term debt	21,000	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	5,587	46,142
Notes payable and other financing
Debt Instrument [Line Items]
Long-term debt	$ 3,096	$ 4,017