Equity Textuals (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Preferred Stock, Shares Authorized		1,000,000	1,000,000
Common stock, shares authorized		500,000,000	500,000,000	500,000,000
Common stock, shares outstanding		204,866,770	204,866,770	212,316,642
Treasury Stock, Shares		591,561	591,561	10,000
Treasury Stock, Shares, Acquired	1,974,053		11,424,446		15,294,567
Treasury Stock, Value, Acquired, Par Value Method	$ 45,100,000		$ 241,700,000		$ 184,900,000
Treasury Stock Acquired, Average Cost Per Share	$ 22.84		$ 21.15		$ 12.09
Stock Repurchase Program, Authorization Increase			290,000,000
Stock Repurchase Program, Authorized Amount		300,000,000	300,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount		238,800,000	238,800,000
Dividends declared per share	$ 0.10	$ 0.09	$ 0.34	$ 0.27	$ 0.23
Payments of Dividends, Common Stock			71,517,000	57,229,000	60,296,000
Purchase of noncontrolling interest			$ 15,000,000	$ 23,333,000	$ 3,000,000