Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Consolidated Balance Sheets
Allowance for doubtful accounts receivable (in dollars)	$ 1,729	$ 2,574
Accumulated amortization on other intangible assets (in dollars)	9,748	9,541
Deferred income taxes included in other long-term liabilities (in dollars)	$ 65,788	$ 53,935
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	119,186,705	118,737,456
Treasury stock, shares	56,600,972	56,348,026