Consolidated Condensed Statements Of Cash Flow (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Shares repurchased under the share repurchase program, value	$ 32,495	[1]	$ 46,624	[1]
Stock Repurchase Authorization [Member]
Shares repurchased under the share repurchase program, value	$ 30,000		$ 44,500

[1] Quarters ended March 31, 2013 and 2012, include $30.0 million and $44.5 million, respectively, repurchased under the share repurchase program launched in fourth quarter 2011.