Interim Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 4,708	$ 3,999
Redeemable preferred stock, par value (dollars per share)	$ 0.1	$ 0.10
Redeemable preferred stock, shares authorized (shares)	5,000	5,000
Redeemable preferred stock, shares issued (shares)	5,000	5,000
Redeemable preferred stock, shares outstanding (shares)	5,000	5,000
Preferred stock, par value (dollars per share)	$ 0.1	$ 0.10
Preferred stock, shares authorized (shares)	200,000	200,000
Preferred stock, shares issued (shares)	0	0
Preferred stock, shares outstanding (shares)	0	0
Common stock, par value (dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	20,000,000	20,000,000
Common stock, shares issued (shares)	6,389,000	6,307,000
Common stock, shares outstanding (shares)	6,157,000	6,075,000
Treasury stock, shares (shares)	232,000	232,000