CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
EQUITY
Preferred stock, par value (in usd per share)	$ 0.01		$ 0.01		$ 0.01
Preferred stock, shares authorized (in shares)	1,090,000		1,090,000		1,090,000
Preferred stock, shares issued (in shares)	0		0		0
Preferred stock, shares outstanding (in shares)	0		0		0
Common stock, par value (in usd per share)	$ 0.01		$ 0.01		$ 0.01
Common stock, shares authorized (in shares)	273,910,000		273,910,000		273,910,000
Common stock, shares issued (in shares)	53,527,838		53,527,838		55,007,983
Common stock, shares outstanding (in shares)	53,527,838		53,527,838		55,007,983
Pension adjustment, income tax benefit	$ 6,000,000		$ 6,000,000		$ 6,000,000
Amounts reclassified out of accumulated other comprehensive loss	$ 0	$ 0	$ 0	$ 0