CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
CURRENT ASSETS:
Customer receivables, allowance for doubtful accounts	$ 431	$ 549
OTHER ASSETS:
Deferred financing costs, accumulated amortization	$ 4,554	$ 4,127
STOCKHOLDERS' EQUITY:
Preferred Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred Stock, shares authorized (in shares)	10,000,000	10,000,000
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized (in shares)	80,000,000	80,000,000
Common Stock, shares issued (in shares)	47,475,570	47,419,115
Common Stock, shares outstanding (in shares)	47,475,570	47,419,115