Basis of Financial Statement Presentation and Summary of Significant Accounting Policies - Part Three (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 03, 2015	Jun. 02, 2011	Jun. 01, 2011
Movement in Standard Product Warranty Accrual [Roll Forward]
Accrued warranty reserve, beginning of period	$ 1,511	$ 833	$ 1,528	$ 638
Estimated warranty expense	764	84	1,136	467
Amounts charged against warranty reserve	(508)	(111)	(897)	(299)
Accrued warranty reserve, end of period	1,767	$ 806	1,767	$ 806
Increase in deferred tax asset valuation allowance			2,700
Valuation allowance for deferred tax assets	$ 132,500		$ 132,500
Amended and Restated 1997 Incentive and Capital Accumulation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			10 years
The Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Par or Stated Value Per Share						$ 1.00
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized						2,200,000	1,500,000
Common Stock, Capital Shares Reserved for Future Issuance	590,483		590,483
Shares available for grant (in shares)					22,405
2015 Incentive Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized					750,000
Common Stock, Capital Shares Reserved for Future Issuance	17,088		17,088
Shares available for grant (in shares)	767,474		767,474