Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accounts receivable, allowance	$ 35,549	$ 32,635
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	10,000	10,000
Preferred stock, issued	0	0
Preferred stock, outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	5,000,000	5,000,000
Common stock, shares issued	1,019,812	1,189,816
Common stock, shares outstanding	1,014,338	1,115,233
Treasury stock at cost, shares	5,474	74,583