Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013
Statement of Financial Position [Abstract]
Trade receivables allowances		$ 19,602	$ 18,908
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares outstanding		46,829,913	46,461,504