Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended						12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Domestic and foreign components of income before income taxes [Abstract]
United States							$ 13,015	$ (38,375)	$ 9,326
Foreign							7,105	3,885	10,783
Income (loss) from continuing operations before income taxes	9,914	[1]	4,827	4,708	(2,479)	(2,096)	20,120	(34,490)	20,109
Current [Abstract]
Federal							505	(2,601)	104
State							419	484	(299)
Foreign							1,855	2,014	2,335
Total current							2,779	(103)	2,140
Deferred [Abstract]
Federal							1,977	(8,676)	3,365
State							905	(2,319)	985
Foreign							1,241	226	(5,793)
Total deferred							4,123	(10,769)	(1,443)
Total	4,158	[1]	1,291	2,104	(184)	(513)	6,902	(10,872)	697
Reconciliation of provision for income taxes for continuing operations [Abstract]
Income taxes at U.S. Federal statutory rate (in hundredths)							35.00%	35.00%	35.00%
Foreign rate differential (in hundredths)							(15.60%)	7.90%	(9.40%)
Valuation allowances (in hundredths)							14.40%	(6.10%)	(32.00%)
Nondeductible expenses (in hundredths)							6.50%	(3.60%)	7.20%
Tax Credits (in hundredths)							(4.70%)	1.30%	(2.20%)
Changes in estimates related to prior years							(4.50%)	(0.30%)	0.40%
State income taxes (in hundredths)							3.60%	3.50%	1.90%
Uncertain tax positions (in hundredths)							(2.60%)	(1.30%)	0.90%
Others, net (in hundredths)							2.20%	(4.90%)	1.70%
Total (in hundredths)							34.30%	31.50%	3.50%
Deferred income tax assets [Abstract]
Operating loss carryforwards	19,010						19,010	27,492
Multiemployer pension withdrawal liability	12,427						12,427	12,075
Income tax credit carryforwards	7,944						7,944	8,051
Capital loss carryforwards	5,353						5,353	6,029
Accruals and reserves not currently deductible	4,516						4,516	3,357
Deferred expenses	1,981						1,981	1,701
Restructuring reserves	1,462						1,462	2,201
Other	3,125						3,125	4,475
Deferred income tax assets	55,818						55,818	65,381
Valuation allowances	(23,864)						(23,864)	(36,099)
Deferred income tax assets, net	31,954						31,954	29,282
Deferred income tax liabilities [Abstract]
Domestic subsidiary stock	(12,525)						(12,525)	(8,208)
Depreciation and amortization	(11,174)						(11,174)	(7,544)
Intangible assets	(6,046)						(6,046)	(5,163)
Inventory	(4,370)						(4,370)	(5,286)
Other	(1,368)						(1,368)	(1,082)
Deferred income tax liabilities	(35,483)						(35,483)	(27,283)
Net deferred tax liability	$ (3,529)						$ (3,529)	$ 1,999

[1] Results for the fourth quarter of 2013 were favorably impacted by a credit to income of approximately $518 for the reversal of a liability recorded in purchase accounting for a recent acquisition that is no longer needed due to statute expiration in the current quarter, and a credit to income of approximately $425 for net reserve reductions at certain of the Company’s vacant leased properties, for which a change in circumstances in the current quarter required a revision in the estimate of future expenses related to the leases. In addition, results for the current quarter were favorably impacted by a credit to income of approximately $736 for the correction of an error in the valuation of unbilled services that was immaterial to all prior periods presented.