Stock-based Compensation and Other Employee Benefit Plans Stock Options Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Outstanding Stock Options Activity [Roll Forward]
Outstanding at December 31 (in shares)	87,862
Exercisable at December 31 (in shares)	87,862
Options Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding - weighted average exercise price per share	$ 12.79
Exercised, weighted average exercise price per share	12.32
Canceled, weighted average exercise price per share	5.18
Vested and Expected to Vest, weighted average exercise price per share	13.05
Exercisable, weighted average exercise price per share	$ 13.05
Outstanding, weighted average remaining contractual term	2 years 10 months 24 days	3 years 9 months 18 days
Vested and Expected to Vest, weighted average remaining contractual term	2 years 10 months 24 days
Exercisable, weighted average remaining contractual term	2 years 10 months 24 days
Options outstanding - aggregate intrinsic value	$ 3,642,000	$ 6,830,000
Vested and Expected to Vest, aggregate intrinsic value	3,642,000
Exercisable, aggregate intrinsic value	3,642,000
Employee Stock Option [Member]
Options Outstanding, Weighted Average Exercise Price [Roll Forward]
Total intrinsic value of options exercised	$ 3,200,000	$ 1,500,000	$ 4,700,000
Non Qualified Stock Options [Member]
Outstanding Stock Options Activity [Roll Forward]
Outstanding at January 1 (in shares)	132,670
Exercised (in shares)	(44,466)
Canceled (in shares)	(342)
Outstanding at December 31 (in shares)	87,862	132,670
Vested and Expected to Vest at December 31(in shares)	87,862
Exercisable at December 31 (in shares)	87,862