Stock-Based Compensation - Schedule of Share-based Compensation, Stock Options, Activity (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Options
Outstanding at the beginning of the Period (in shares)	169,300
Exchanged (in shares)	1,351,168
Expired (in shares)	(51,700)
Exercised - in shares	(975,174)
Outstanding at the end of the Period (in shares)	493,594	169,300
Range of Exercise Price
Lower end of exercise price	$ 3.94	$ 2.44
Upper end of exercise price	15.60	16.27
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	9.94
Exchanged (in dollars per share)	10.12
Expired (in dollars per share)	2.97
Exercised (in dollars per share)	9.34
Outstanding at the end of the period ( in dollars per share)	$ 12.24	$ 9.94
Weighted- Average Remaining Contractual Life
Weighted- Average Remaining Contractual Life (in years)	1 year 2 months 16 days	10 months 10 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value	$ 3.7	$ 1.2
Exchanged
Range of Exercise Price
Lower end of exercise price	$ 6.87
Upper end of exercise price	15.60
Expired
Range of Exercise Price
Lower end of exercise price	2.44
Upper end of exercise price	3.94
Exercised
Range of Exercise Price
Lower end of exercise price	6.87
Upper end of exercise price	$ 16.27