Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2012	Sep. 30, 2013 Restated [Member]
Allowance for doubtful accounts	$ 6,231	$ 5,744
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	145,000	145,000
Common stock, shares issued	45,765	48,569
Common stock, shares outstanding	45,765	48,569