Consolidated Condensed Statements of Cash Flows (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Shares repurchased under the share repurchase program, value	$ 32,495	[1]
Stock Repurchase Authorization [Member] | Common Stock [Member]
Shares repurchased under the share repurchase program, value	$ 30,000

[1] Quarter ended March 31, 2013, includes $30.0 million repurchased under the share repurchase program launched in fourth quarter 2011.