Changes in Stockholders' Equity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Balance			$ 415,850
Net (loss)/income	(33,745)	8,762	13,296	25,495
Dividends declared			(8,460)
Compensation and benefits paid or payable in Class A Common Stock			668
Options exercised			280
Currency translation adjustment			(7,222)
Pension settlement			79,204
Pension plan remeasurement			(17,347)
Amortization of pension liability			1,840
Change in derivative valuation adjustment			(405)
Balance	477,704		477,704
Class A Common Stock [Member]
Balance			37
Net (loss)/income
Dividends declared
Compensation and benefits paid or payable in Class A Common Stock
Options exercised
Currency translation adjustment
Pension settlement
Pension plan remeasurement
Amortization of pension liability
Change in derivative valuation adjustment
Balance	37		37
Class B Common Stock [Member]
Balance			3
Net (loss)/income
Dividends declared
Compensation and benefits paid or payable in Class A Common Stock
Options exercised
Currency translation adjustment
Pension settlement
Pension plan remeasurement
Amortization of pension liability
Change in derivative valuation adjustment
Balance	3		3
Additional Paid-in Capital [Member]
Balance			391,495
Net (loss)/income
Dividends declared
Compensation and benefits paid or payable in Class A Common Stock			412
Options exercised			280
Currency translation adjustment
Pension settlement
Pension plan remeasurement
Amortization of pension liability
Change in derivative valuation adjustment
Balance	392,187		392,187
Retained Earnings [Member]
Balance			422,044
Net (loss)/income			13,296
Dividends declared			(8,460)
Compensation and benefits paid or payable in Class A Common Stock
Options exercised
Currency translation adjustment
Pension settlement
Pension plan remeasurement
Amortization of pension liability
Change in derivative valuation adjustment
Balance	426,880		426,880
Accumulated Items of Other Comprehensive Income [Member]
Balance			(139,809)
Net (loss)/income
Dividends declared
Compensation and benefits paid or payable in Class A Common Stock
Options exercised
Currency translation adjustment			(7,222)
Pension settlement			79,204
Pension plan remeasurement			(17,347)
Amortization of pension liability			1,840
Change in derivative valuation adjustment			(405)
Balance	(83,739)		(83,739)
Treasury Stock [Member]
Balance			(257,920)
Net (loss)/income
Dividends declared
Compensation and benefits paid or payable in Class A Common Stock			256
Options exercised
Currency translation adjustment
Pension settlement
Pension plan remeasurement
Amortization of pension liability
Change in derivative valuation adjustment
Balance	$ (257,664)		$ (257,664)