Retirement Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Oct. 01, 2016
Defined Benefit Plan, Target Plan Asset Allocations	100.00%
Defined Benefit Plan, Actual Plan Asset Allocations	100.00%
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	$ 500
Defined Benefit Plan, Benefit Obligation	13,728			$ 14,689
Defined Benefit Plan, Interest Cost	131
Defined Benefit Plan, Actuarial Gain (Loss)	(205)
Defined Benefit Plan, Benefits Paid	(334)
Defined Benefit Plan, Other Costs	(553)
Defined Benefit Plan, Fair Value of Plan Assets	9,228			$ 10,228
Defined Benefit Plan, Actual Return on Plan Assets	(113)
Defined Benefit Plan, Funded Status of Plan	(4,500)
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	1,620
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	710
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	580
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	630
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	1,500
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	4,250
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities	$ 0
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	3.85%
Defined Benefit Plan, Expected Return on Plan Assets	$ (86)
Defined Benefit Plan, Service Cost	$ 0
Defined contribution 401(k) plan, employer matching contribution, percent of match	50.00%
Defined contribution 401(k) plan, employee contributions subject to employer match (percent)	4.00%
401(k) plan, expense for matching contributions	$ 3,400	$ 3,400	$ 3,300
Defined Benefit Plan, Net Periodic Pension Benefit Cost
Defined Benefit Plan, Amortization of Gains (Losses)	0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	0
Defined Benefit Plan, Net Periodic Benefit Cost	45
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	6
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), Net of Tax	0
Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, Net of Tax	0
Minimum pension liability adjustment	$ 6	$ 0	$ 0
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	6.30%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.15%
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	$ 4,500
Pension and Other Postretirement Defined Benefit Plans, Liabilities	4,500
Amount Recognized in Net Periodic Benefit Cost and Other Comprehensive Income (Loss), before Tax	(39)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	6
Fair Value, Measurements, Recurring [Member]
Defined Benefit Plan, Fair Value of Plan Assets	9,228
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Defined Benefit Plan, Fair Value of Plan Assets	6,361
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Defined Benefit Plan, Fair Value of Plan Assets	2,867
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 0
Fixed Income Investments [Member]
Defined Benefit Plan, Target Plan Asset Allocations	50.00%
Defined Benefit Plan, Actual Plan Asset Allocations	52.00%
Fixed Income Investments [Member] | Fair Value, Measurements, Recurring [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 4,769
Fixed Income Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Defined Benefit Plan, Fair Value of Plan Assets	4,294
Fixed Income Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Defined Benefit Plan, Fair Value of Plan Assets	475
Fixed Income Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 0
Domestic Income [Member]
Defined Benefit Plan, Target Plan Asset Allocations	20.00%
Defined Benefit Plan, Actual Plan Asset Allocations	21.00%
Domestic Income [Member] | Fair Value, Measurements, Recurring [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 1,942
Domestic Income [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Defined Benefit Plan, Fair Value of Plan Assets	188
Domestic Income [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Defined Benefit Plan, Fair Value of Plan Assets	1,754
Domestic Income [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 0
International Equity [Member]
Defined Benefit Plan, Target Plan Asset Allocations	12.00%
Defined Benefit Plan, Actual Plan Asset Allocations	14.00%
International Equity [Member] | Fair Value, Measurements, Recurring [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 1,285
International Equity [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Defined Benefit Plan, Fair Value of Plan Assets	1,054
International Equity [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Defined Benefit Plan, Fair Value of Plan Assets	231
International Equity [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 0
Hedge Funds, Equity [Member]
Defined Benefit Plan, Target Plan Asset Allocations	10.00%
Defined Benefit Plan, Actual Plan Asset Allocations	9.00%
Hedge Funds, Equity [Member] | Fair Value, Measurements, Recurring [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 825
Hedge Funds, Equity [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Defined Benefit Plan, Fair Value of Plan Assets	825
Hedge Funds, Equity [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0
Hedge Funds, Equity [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 0
Real Assets [Member]
Defined Benefit Plan, Target Plan Asset Allocations	8.00%
Defined Benefit Plan, Actual Plan Asset Allocations	4.00%
Real Assets [Member] | Fair Value, Measurements, Recurring [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 407
Real Assets [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0
Real Assets [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Defined Benefit Plan, Fair Value of Plan Assets	407
Real Assets [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 0