CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	1,090,000	1,090,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	273,910,000	273,910,000
Common stock, shares issued (in shares)	32,547,258	53,599,433
Common stock, shares outstanding (in shares)	32,547,258	53,599,433
Pension adjustment, income tax benefit	$ 6,000,000	$ 6,000,000
Amounts reclassified out of Accumulated other comprehensive loss	$ 0	$ 0