Employee Benefits - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Definedcontributionemployeeautomaticcontributionpercentag	6.00%
Company 401K plan contribution (percentage)	3.00%
Employer matching contribution, percent of match	100.00%
Maximum annual contributions per employee, percent	6.00%
Employee salary deferral contributions percentage vested	100.00%
Employer contribution annual vesting percentage	20.00%
Employer matching contributions	$ 5,900	$ 9,000	$ 6,800
Administrative expenses	$ 40	100	200
Profits sharing, percent of pre-tax profit paid to eligible employees on quarterly basis	10.00%
Profit sharing expense	$ 9,000	$ 8,000	$ 7,800
Effective January 1, 2016 [Member]
Defined Benefit Plan Disclosure [Line Items]
Company 401K plan contribution (percentage)	3.00%
Employer matching contribution, percent of match	175.00%
Maximum annual contributions per employee, percent	6.00%
Over Two Years
Defined Benefit Plan Disclosure [Line Items]
Company 401K plan contribution (percentage)	3.00%