Stock-based Compensation and Benefits - (Summary of Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding Options, beginning	2,185,922
Granted, Options	99,920
Forfeited, Options	(16,225)
Exercised, Options	(585,750)
Outstanding Options, ending	1,683,867	2,185,922
Options fully vested and exercisable at end of period, Options	1,429,584
Options expected to vest, Options	1,662,690
Outstanding, Weighted average exercise price, beginning	$ 19.81
Granted, Weighted average exercise price	33.98
Forfeited, Weighted average exercise price	21.84
Exercised, Weighted average exercise price	19.93
Outstanding, Weighted average exercised price, ending	20.61	$ 19.81
Options fully vested and exercisable at end of period, Weighted average exercise price	19.80
Options expected to vest, Weighted average exercise price	$ 20.53
Outstanding, Weighted average remaining contractual term in years	4 years 6 months 7 days	4 years 10 months 6 days
Options fully vested and exercisable at end of period, weighted average remaining contractual term in years	3 years 9 months 7 days
Options expected to vest, Weighted average remaining contractual term in years	4 years 5 months 16 days
Outstanding, Aggregate intrinsic value, beginning	$ 7,753
Outstanding, Outstanding, Aggregate intrinsic value, beginning	21,136	$ 7,753
Aggregate intrinsic Value of Options fully vested and exercisable at end of period	19,021
Options expected to vest, Aggregate Intrinsic Value	$ 20,994