Consolidated Statements of Equity (USD $)		Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Balance at Dec. 31, 2011		$ 517,001,000	$ 543,000	$ 515,421,000	$ 96,105,000	$ (97,548,000)	$ 2,480,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		39,922,000			40,188,000		(266,000)
Changes in defined benefit pension plans		(18,009,000)				(18,009,000)
Change in fair value of derivative		(1,009,000)				(1,009,000)
Repurchase of Class A Common shares		(23,564,000)	(25,000)	(23,539,000)
Compensation plans: net share issued	[1]	18,290,000	37,000	18,253,000	0
Excess tax expense of compensation plans		7,553,000		7,553,000
Other		(274,000)				(274,000)
Balance at Dec. 31, 2012		539,910,000	555,000	517,688,000	136,293,000	(116,840,000)	2,214,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(724,000)			(474,000)		(250,000)
Changes in defined benefit pension plans		35,811,000				35,811,000
Change in fair value of derivative		291,000				291,000
Repurchase of Class A Common shares		(74,199,000)	(51,000)	(55,222,000)	(18,926,000)
Compensation plans: net share issued	[1]	46,833,000	56,000	46,777,000
Other		(185,000)				(185,000)
Balance at Dec. 31, 2013		547,737,000	560,000	509,243,000	116,893,000	(80,923,000)	1,964,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		10,222,000			10,529,000		(307,000)
Changes in defined benefit pension plans		(45,500,000)				(45,500,000)
Change in fair value of derivative		239,000				239,000
Repurchase of Class A Common shares		(21,237,000)	(12,000)	(12,496,000)	(8,729,000)
Compensation plans: net share issued	[1]	20,160,000	22,000	20,138,000
Excess tax expense of compensation plans		8,571,000		8,571,000
Other		(259,000)				(259,000)
Balance at Dec. 31, 2014		$ 519,933,000	$ 570,000	$ 525,456,000	$ 118,693,000	$ (126,443,000)	$ 1,657,000

[1] * Net of tax payments related to shares withheld for vested stock and RSUs of $4,261 in 2014, $6,270 in 2013, and $7,658 in 2012.