Employee Benefit Plans (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) h	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Mandatory work hours per year | h	1,000
Mandatory 401(k) match	$ 0.25
Maximum annual employer 401(k) contribution	6.00%
Amount expensed for 401(k) contributions	$ 841,000	$ 759,000	$ 774,000
Accrued liability for plan	1,600,000	1,400,000
Increase in non-qualified deferred compensation plan	199,000	99,000	140,000
Aggregate payout under profit sharing plan	1,100,000	1,200,000	1,000,000
Supplemental Employee Retirement Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Contributions to supplemental plan	299,000	228,000	184,000
Accrued liability for plan	2,600,000	2,500,000
RML
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Amount expensed for 401(k) contributions	$ 190,000	172,000	12,000
Term of service required	3 months
Age requirement	20 years 6 months
RML | Supplemental Employee Retirement Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Contributions to supplemental plan	$ 673,000	692,000	$ 87,000
Accrued liability for plan	$ 2,900,000	$ 2,900,000
Vesting period	10 years