Stock-based Compensation and Benefits - (Summary of Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding Options, beginning	2,596,251	3,597,111
Granted, Options	175,693
Forfeited, Options	(39,768)
Surrendered, Options	(451,766)
Exercised, Options	(83,004)
Expired, Options	(11,484)
Outstanding Options, ending	2,185,922	2,596,251
Options fully vested and exercisable at end of period, Options	1,851,858
Options expected to vest, Options	313,403
Outstanding, Weighted average exercise price, beginning	$ 19.84	$ 19.90
Granted, Weighted average exercise price	19.74
Forfeited, Weighted average exercise price	19.25
Surrendered, Weighted average exercise price	19.98
Exercised, Weighted average exercise price	19.91
Expired, Weighted average exercise price	19.68
Outstanding, Weighted average exercised price, ending	19.81	$ 19.84
Options fully vested and exercisable at end of period, Weighted average exercise price	19.91
Options expected to vest, Weighted average exercise price	$ 19.34
Outstanding, Weighted average remaining contractual term in years	4 years 10 months 6 days	4 years 9 months 7 days
Options fully vested and exercisable at end of period, weighted average remaining contractual term in years	3 years 5 months 16 days
Options expected to vest, Weighted average remaining contractual term in years	8 years 3 months 26 days
Outstanding, Aggregate intrinsic value, beginning	$ 3,968
Outstanding, Outstanding, Aggregate intrinsic value, beginning	7,753	$ 3,968
Aggregate intrinsic Value of Options fully vested and exercisable at end of period	6,060
Options expected to vest, Aggregate Intrinsic Value	$ 1,266