Pension Plan and 401(k) Plan (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Nonrecurring pretax termination charge		$ 3,350	$ 0	$ 0
Change in benefit obligation [Roll Forward]
Benefit obligation at beginning of year		7,062	7,039
Service cost		0	0
Interest cost		268	279	260
Benefits paid		(6,977)	(461)
Actuarial (gain) loss		(353)	205
Benefit obligation at end of year		0	7,062	7,039
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year		5,499	5,691
Actual return on plan assets		(76)	269
Employer contribution		1,554	0
Benefits paid		(6,977)	(461)
Fair value of plan assets at end of year		0	5,499	5,691
Funded Status at end of year		0	(1,563)
Amounts recognized in the consolidated balance sheets [Abstract]
Accrued pension liability					$ 0	$ (1,563)
Amounts recognized in accumulated other comprehensive (income) loss [Abstract]
Loss		0	3,741
Deferred taxes		0	(1,272)
Net loss		$ 0	$ 2,469
Accumulated benefit obligation					$ 0	$ 7,062
Assumptions used to determine the benefit obligations at December 31 [Abstract]
Discount rate					0.00%	3.86%
Weighted-average assumptions used to determine net periodic pension cost [Abstract]
Discount rate		3.86%	4.03%
Expected long-term rate of return on plan assets		7.00%	7.00%
Components of net periodic pension cost [Abstract]
Interest cost		$ 268	$ 279	260
Expected return on plan assets		(376)	(391)	(376)
Amortization of unrecognized loss	[1]	490	504	390
Preliminary net periodic pension cost		382	392	274
Settlement/curtailment expense		3,350	0	0
Net periodic pension plan cost		3,732	392	274
Components of other amounts recognized in other comprehensive income (loss) [Abstract]
Net actuarial (gain) loss		99	327	627
Settlement loss		(3,350)	0	0
Amortization of actuarial loss	[1]	(490)	(504)	(390)
Total recognized in other comprehensive income (loss)		(3,741)	(177)	237
Total recognized in net periodic benefit cost and other comprehensive income (loss)		(9)	215	511
Fair value of pension plan assets by asset category [Abstract]
Fair Value of pension plan assets		5,499	5,499	5,691	$ 0	$ 5,499
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Contributions		$ 1,554	0
401(K) PLAN [Abstract]
Employer matching contribution		100.00%
Employee contribution		4.00%
Profit sharing contributions vesting period		6 years
Profit sharing contributions		$ 536	523	$ 519
Money Market Funds [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year		2,839
Fair value of plan assets at end of year			2,839
Fair value of pension plan assets by asset category [Abstract]
Fair Value of pension plan assets		2,839	2,839			2,839
Mutual Funds [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year			0
Fair value of pension plan assets by asset category [Abstract]
Fair Value of pension plan assets		0	0			0
Common Stock [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year		1,129
Fair value of plan assets at end of year			1,129
Fair value of pension plan assets by asset category [Abstract]
Fair Value of pension plan assets		1,129	1,129			1,129
Corporate Bonds [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year		1,472
Fair value of plan assets at end of year			1,472
Fair value of pension plan assets by asset category [Abstract]
Fair Value of pension plan assets		1,472	1,472			1,472
Partnership Investment [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year		59
Fair value of plan assets at end of year			59
Fair value of pension plan assets by asset category [Abstract]
Fair Value of pension plan assets		59	59			59
Level 1 [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year		3,968
Fair value of plan assets at end of year			3,968
Fair value of pension plan assets by asset category [Abstract]
Fair Value of pension plan assets		3,968	3,968			3,968
Level 1 [Member] | Money Market Funds [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year		2,839
Fair value of plan assets at end of year			2,839
Fair value of pension plan assets by asset category [Abstract]
Fair Value of pension plan assets		2,839	2,839			2,839
Level 1 [Member] | Mutual Funds [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year			0
Fair value of pension plan assets by asset category [Abstract]
Fair Value of pension plan assets		0	0			0
Level 1 [Member] | Common Stock [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year		1,129
Fair value of plan assets at end of year			1,129
Fair value of pension plan assets by asset category [Abstract]
Fair Value of pension plan assets		1,129	1,129			1,129
Level 1 [Member] | Corporate Bonds [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year			0
Fair value of pension plan assets by asset category [Abstract]
Fair Value of pension plan assets		0	0			0
Level 1 [Member] | Partnership Investment [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year			0
Fair value of pension plan assets by asset category [Abstract]
Fair Value of pension plan assets		0	0			0
Level 2 [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year		1,531
Fair value of plan assets at end of year			1,531
Fair value of pension plan assets by asset category [Abstract]
Fair Value of pension plan assets		1,531	1,531			1,531
Level 2 [Member] | Money Market Funds [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year			0
Fair value of pension plan assets by asset category [Abstract]
Fair Value of pension plan assets		0	0			0
Level 2 [Member] | Mutual Funds [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year			0
Fair value of pension plan assets by asset category [Abstract]
Fair Value of pension plan assets		0	0			0
Level 2 [Member] | Common Stock [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year			0
Fair value of pension plan assets by asset category [Abstract]
Fair Value of pension plan assets		0	0			0
Level 2 [Member] | Corporate Bonds [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year		1,472
Fair value of plan assets at end of year			1,472
Fair value of pension plan assets by asset category [Abstract]
Fair Value of pension plan assets		1,472	1,472			1,472
Level 2 [Member] | Partnership Investment [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year		59
Fair value of plan assets at end of year			59
Fair value of pension plan assets by asset category [Abstract]
Fair Value of pension plan assets		59	59			59
Level 3 [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year			0
Fair value of pension plan assets by asset category [Abstract]
Fair Value of pension plan assets		0	0			0
Level 3 [Member] | Money Market Funds [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year			0
Fair value of pension plan assets by asset category [Abstract]
Fair Value of pension plan assets		0	0			0
Level 3 [Member] | Mutual Funds [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year			0
Fair value of pension plan assets by asset category [Abstract]
Fair Value of pension plan assets		0	0			0
Level 3 [Member] | Common Stock [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year			0
Fair value of pension plan assets by asset category [Abstract]
Fair Value of pension plan assets		0	0			0
Level 3 [Member] | Corporate Bonds [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year			0
Fair value of pension plan assets by asset category [Abstract]
Fair Value of pension plan assets		0	0			0
Level 3 [Member] | Partnership Investment [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year			0
Fair value of pension plan assets by asset category [Abstract]
Fair Value of pension plan assets		$ 0	$ 0			$ 0

[1] (1) This accumulated other comprehensive loss component is included in the computation of net periodic pension cost (see Note 14. Pension Plan and 401(k) Plan for additional details).