Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Statement of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 6,628	$ 7,163
Allowance for credit losses	1,341	875
Accumulated amortization - goodwill and other intangibles	$ 6,197	$ 5,995
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	200,000,000	200,000,000
Common stock, shares issued (shares)	67,779,637	67,407,473
Common stock, shares outstanding (shares)	67,779,637	67,407,473