Long-Term and Other Debt (Details 4) In Thousands, unless otherwise specified	12 Months Ended		1 Months Ended		12 Months Ended													1 Months Ended
	Dec. 31, 2011 Credit agreement USD ($) denominator numerator	Dec. 31, 2011 Credit agreement GBP (£)	Mar. 31, 2011 Credit agreement March Amendment USD ($)	Mar. 11, 2011 Credit agreement March Amendment USD ($)	Dec. 31, 2011 Credit agreement August Amendment USD ($)	Dec. 31, 2011 Credit agreement Minimum USD ($)	Mar. 11, 2011 Credit agreement Minimum March Amendment USD ($)	Dec. 31, 2011 Credit agreement Maximum USD ($)	Mar. 11, 2011 Credit agreement Maximum March Amendment USD ($)	Aug. 25, 2011 Credit agreement Maximum August Amendment USD ($)	Dec. 31, 2011 Credit agreement Fiscal quarter ending December 31, 2013 numerator denominator	Dec. 31, 2011 Credit agreement Fiscal quarter ending January 1, 2014 through December 31, 2014 denominator numerator	Dec. 31, 2011 Credit agreement Fiscal quarter ended January 1, 2015 and thereafter denominator numerator	Dec. 31, 2011 Credit agreement Four consecutive fiscal quarters USD ($) denominator numerator	Mar. 11, 2011 Credit agreement Four consecutive fiscal quarters March Amendment USD ($)	Dec. 31, 2011 Credit agreement Fiscal quarter ending on or prior to June 30, 2012 USD ($)	Mar. 11, 2011 Credit agreement Fiscal quarter ending on or prior to June 30, 2012 March Amendment USD ($)	Feb. 29, 2012 Secured senior term loan and revolving credit facility USD ($)	Feb. 21, 2012 Secured senior term loan and revolving credit facility USD ($)	Aug. 25, 2011 Senior secured revolving credit facility August Amendment USD ($)	Aug. 25, 2011 Term Loan August Amendment USD ($)
Debt Instrument
Percentage of additional fees payable to lenders if Consolidated Leverage Ratio is less than 4.25 to 1.00	0.50%	0.50%
Consolidated leverage ratio, numerator	4.25	4.25									5.75	5.50	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%	0.75%
Percentage of ownership in subsidiaries guaranteeing credit obligation	100.00%	100.00%
Percentage of ownership in subsidiaries' lien on assets	100.00%	100.00%
Percentage of capital stock lien on assets in 100 percent domestic subsidiaries	100.00%	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			25,000										25,000	25,000	30,000	30,000
Maximum amount of noncash compensation expense that may be added back in calculation of EBITDA								993		993
Maximum amount of unrestricted cash and investments that may be netted against consolidated total debt in calculating the leverage and debt ratios								100,000	100,000
Amount of unrestricted cash and investments that if in excess, may be netted against consolidated total debt up to a maximum amount						15,000	15,000
Fees and expenses			2,600		6,300
Amount of debt instrument in which the maturity period was extended																				247,000	555,800
Amount of debt instrument in which maturity period was extended, expressed as a percentage of the total debt commitment outstanding at the time of amendment																				99.00%	98.00%
Refinanced amount																			16,400
Fees and expenses																		57
Consolidated senior debt ratio as of the last day of each fiscal quarter, numerator	2.75	2.75
Consolidated senior debt ratio as of the last day of each fiscal quarter, denominator	1.00	1.00
Consolidated interest coverage ratio for any period of four consecutive quarters, numerator														2.25
Consolidated interest coverage ratio for any period of four consecutive quarters, denominator														1.00
Expenses, charges or losses resulting from certain Peru investments	3,000
Permitted add-backs, during twelve month period	15,000
Payment of restructuring charges, transaction expenses and shutdown expenses, maximum	7,325
Payment of license royalties or other fees, maximum		£ 5,250