Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Consolidated Balance Sheets
Receivables: allowance for doubtful accounts (in dollars)	$ 668	$ 714
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	68,000,000	68,000,000
Common stock, shares outstanding	47,740,957	41,908,218