Stock Based Compensation Stock Based Compensation (Summary of stock option awards) (Details) - Stock options [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Stock Options, Number of options outstanding (in shares):
Outstanding, beginning balance (in shares)	1,228	0
Legacy SBS stock options assumed (in shares)		1,229
Granted (in shares)	3	0
Exercised (in shares)	(175)	0
Forfeited (in shares)	(10)	(1)
Expired (in shares)	(22)	0
Outstanding, ending balance (in shares)	1,024	1,228
Exercisable at December 31, 2016 (in shares)	884
Vested and expected to vest at December 31, 2016	1,024
Stock Options, Weighted average exercise price (in dollars per share):
Outstanding, beginning balance (in dollars per share)	$ 14.17	$ 0.00
Legacy SBS stock options assumed (in dollars per share)		14.18
Granted (in dollars per share)	17.04	0.00
Exercised (in dollars per share)	7.90	0.00
Forfeited (in dollars per share)	17.04	17.04
Expired (in dollars per share)	17.53	0.00
Outstanding, ending balance (in dollars per share)	15.15	$ 14.17
Exercisable at December 31, 2016 (in dollars per share)	14.85
Vested and expected to vest at December 31, 2016	$ 15.15
Stock Options, Contractual Term (in years)
Outstanding at December 31, 2016	7 years 2 months 12 days
Exercisable at December 31, 2016	6 years 10 months 24 days
Vested and expected to vest at December 31, 2016	7 years 2 months 12 days
Stock Options, Intrinsic Value
Outstanding at December 31, 2016	$ 4,728
Exercisable at December 31, 2106	4,382
Vested and expected to vest at December 31, 2016	$ 4,728