Summary of Significant Accounting Policies - Part Three (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended			0 Months Ended		3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Jun. 02, 2011 The Incentive Plan [Member]	Jun. 01, 2011 The Incentive Plan [Member]	Mar. 31, 2014 Amended and Restated 1997 Incentive and Capital Accumulation Plan [Member]
Movement in Standard Product Warranty Accrual [Roll Forward]
Accrued warranty reserve, beginning of period	$ 638	$ 549
Estimated warranty expense	383	108
Amounts charged against warranty reserve	(188)	(204)
Accrued warranty reserve, end of period	833	453
Increase in deferred tax asset valuation allowance	732
Valuation allowance for deferred tax assets	$ 130,964
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period						10 years
Common Stock, Par or Stated Value Per Share	$ 1		$ 1	$ 1.00
Increase decrease in authorized shares under incentive plan				700,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized				2,200,000	1,500,000