Long-Term and Other Debt (Details 4)		12 Months Ended												1 Months Ended
	Dec. 31, 2012 Numerator	Dec. 31, 2012 Credit Agreement [Member] USD ($) Numerator	Dec. 31, 2011 Credit Agreement [Member] USD ($) Numerator	Dec. 31, 2011 Credit Agreement [Member] GBP (£) Numerator	Dec. 31, 2011 Credit Agreement [Member] August Amendment USD ($)	Dec. 31, 2012 Credit Agreement [Member] Minimum USD ($)	Dec. 31, 2012 Credit Agreement [Member] Maximum USD ($)	Dec. 31, 2012 Credit Agreement [Member] Fiscal quarter ending December 31, 2013 Numerator	Dec. 31, 2012 Credit Agreement [Member] Fiscal quarter ended January 1, 2015 and thereafter Numerator	Dec. 31, 2012 Credit Agreement [Member] Four consecutive fiscal quarters Numerator	Dec. 31, 2011 Credit Agreement [Member] Four consecutive fiscal quarters Numerator	Dec. 31, 2012 Credit Agreement [Member] Fiscal Quarter Ending June 30 2012 Minimum USD ($)	Dec. 31, 2012 Credit Agreement [Member] Four Consecutive Fiscal Quarters Ending December 31, 2009 and Through June 30, 2010 Minimum USD ($)	Aug. 31, 2011 Term Loan August Amendment tranche	Dec. 31, 2012 Term Loan August Amendment Numerator	Feb. 21, 2012 Secured Senior Term Loan and Revolving Credit Facility [Member] USD ($)
Debt Instrument
Percentage of additional fees payable to lenders if Consolidated Leverage Ratio is less than 4.25 to 1.00		0.50%
Consolidated leverage ratio, numerator	5.50		4.25	4.25				5.75	5.25
Consolidated leverage ratio, denominator		1.00						1.00	1.00	1.00					1.00
Percentage of additional fees payable to lenders if Consolidated Leverage Ratio is greater than or equal to 4.25 to 1.00		0.75%
Percentage of ownership in subsidiaries guaranteeing credit obligation		100.00%
Percentage of capital stock lien on assets in foreign subsidiaries			65.00%	65.00%
Minimum proceeds from sale of assets that would require minimum prepayment of loan		$ 5,000
Minimum threshold of debt of equity investee LNS in determining interest expense used in calculation of EBITDA		25,000,000										30,000,000	25,000,000
Maximum amount of noncash compensation expense that may be added back in calculation of EBITDA		993,000
Maximum amount of unrestricted cash and investments that may be netted against consolidated total debt in calculating the leverage and debt ratios							100,000,000
Amount of unrestricted cash and investments that if in excess, may be netted against consolidated total debt up to a maximum amount						15,000,000
Fees and expenses					6,300,000
Refinanced amount																16,400,000
Consolidated senior debt ratio as of the last day of each fiscal quarter, numerator			2.75	2.75
Number of tranche requests														1
Consolidated interest coverage ratio for any period of four consecutive quarters, numerator											2.25
Expenses, charges or losses resulting from certain Peru investments			3,000,000
Permitted add-backs, during twelve month period		15,000,000
Permitted add-backs, period		12 years
Payment of restructuring charges, transaction expenses and shutdown expenses, maximum			7,325,000
Payment of license royalties or other fees, maximum				£ 5,250,000