Discontinued Operations Summarized results of discontinued operations (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016		Mar. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Disposal Group, Including Discontinued Operation, Revenue		$ 29,680		$ 33,688
Disposal Group, Including Discontinued Operation, Cost of Goods Sold, Direct Materials		21,027		23,990
Disposal Group, Including Discontinued Operation, Operating Expense		7,288		8,468
Disposal Group, Including Discontinued Operation, Interest Expense	[1]	333		382
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax		1,032		848
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation		(3,908)	[2]	313
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax		2,994		0
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest		$ 7,934		$ 535

[1] (a)Interest expense was allocated to the discontinued operation based on the debt that was required to be paid as a result of the sale of TPI.

[2] (b) Income tax benefit includes $4,207 reversal of valuation allowance resulting from the sale of TPI during the three months ended March 31, 2016.