Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Statement Of Financial Position [Abstract]
Receivables, allowance	$ 2,238	$ 900
Preferred stock, par value	$ 1	$ 1
Preferred stock, authorized shares	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 1	$ 1
Common stock, authorized shares	150,000,000	150,000,000
Common stock, shares issued	33,118,000	32,215,000
Common stock, shares outstanding	33,118,000	32,215,000
Treasury stock, shares, at cost	3,351,000	3,351,000