Equity (Stock Repurchase Program) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Aug. 04, 2016	Feb. 15, 2016	Dec. 31, 2015
Stock Repurchase Program
Repurchase of common stock, authorized amount				$ 50,000,000.0
Treasury stock, shares, acquired	9,500,000	44,235
Treasury stock value acquired including acquisition costs	$ 91,800,000	$ 600,000
Treasury stock acquired, average cost per share (in dollars per share)	$ 9.71	$ 12.66
Available repurchase of common stock, authorized amount (up to)	$ 7,000,000				$ 48,700,000
Subsequent Event
Stock Repurchase Program
Repurchase of common stock, authorized amount			$ 50,000,000