Employee Benefit Plans (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Employee Benefit Plan (Textual) [Abstract]
Employees annual compensation	3.00%
Safe Harbor match	$ 900,000	$ 700,000	$ 600,000
Discretionary matching contributions	1,100,000	900,000	800,000
No additional discretionary contributions	$ 0	$ 0	$ 0