CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accounts receivable, allowance for doubtful accounts (in dollars)	$ 1,757	$ 1,707
Deposits and other assets, restricted (in dollars)	355	$ 389
Installment payment agreement, discount	$ 678
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	45,198,718	46,398,729
Common stock, shares outstanding	45,198,718	46,398,729
Senior Secured 2022 Notes Member
Unamortized debt costs	$ 1,252
Senior Secured 2018 Notes Member
Unamortized debt costs	4,230	$ 3,041
Senior Unsecured Notes
Unamortized debt costs	$ 3,305	$ 3,820