Stock-Based Compensation (Stock Option Activity) (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Number of Options
Outstanding at beginning of period (in shares)	2,262	1,763	2,211
Granted as a result of the Merger and Spin-Off (in shares)		1,222
Exercised (in shares)	(577)	(2)	(23)
Forfeited/Expired (in shares)	(756)	(721)	(425)
Outstanding at end of period (in shares)	929	2,262	1,763
Options Exercisable at end of period (in shares)	929
Weighted Average Exercise Price Per Option
Outstanding at beginning of period (in usd per share)	$ 10.82	$ 22.05	$ 22.69
Granted as a result of the Merger and Spin-Off (in usd per share)		11.78
Exercised (in usd per share)	7.51	8.35	8.02
Forfeited/Expired (in usd per share)	18.47	27.24	21.98
Outstanding at end of period (in usd per share)	6.59	$ 10.82	$ 22.05
Options Exercisable at end of period (in usd per share)	$ 6.59