Condensed Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Allowance for doubtful accounts	$ 1,046	$ 3,388
Unamortized debt discount, current	0	3
Unamortized debt discount, noncurrent	$ 0	$ 0
Stockholders' Equity Note [Abstract]
Common stock, shares issued	32,977,713	33,416,110
Common stock, shares outstanding	32,977,713	33,416,110
Treasury stock, shares	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (per share)	$ 0.10	$ 0.10
Common stock, shares authorized	60,000,000	60,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares authorized	500,000	500,000
Preferred stock, par value (per share)	$ 0.10	$ 0.10