Earnings (Loss) per Share - Anti-Dilutive Securities (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total Securities	10,448	12,374	11,600
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total Securities	0	202	456
Restricted stock and performance shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total Securities	3,706	5,430	4,402
Convertible preferred stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total Securities	6,742	6,742	6,742