Consolidated Condensed Statements of Cash Flows (Parenthetical) (USD $)	9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013
Shares repurchased under the share repurchase program, value	$ 28,903,000	[1]	$ 91,395,000	[1]
Stock Repurchase Authorization [Member] | Common Stock [Member]
Shares repurchased under the share repurchase program, value	$ 24,000,000		$ 87,600,000

[1] 2014 includes $24.0 million repurchased under the share repurchase program launched in January 2014. 2013 includes $87.6million repurchased under the share repurchase program launched in 2011.