Condensed Consolidated Statements of Equity (USD $) In Thousands, unless otherwise specified		Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Balance at Dec. 31, 2012		$ 539,910	$ 555	$ 517,688	$ 136,293	$ (116,840)	$ 2,214
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss		(2,671)			(2,671)
Changes in defined benefit pension plans		851				851
Changes in fair value of derivative		59				59
Repurchase 942.134 Class A Common Shares in 2013 and 988,990 Class A Common Shares in 2014		(10,648)	(9)	(10,639)
Compensation plans: 2,414,889 net shares issued in 2013 and 1,065,619 in 2014	[1]	13,132	24	13,108
Balance at Mar. 31, 2013		540,633	570	520,157	133,622	(115,930)	2,214
Balance at Dec. 31, 2013		547,737	560	509,243	116,893	(80,923)	1,964
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss		(612)			(612)
Changes in defined benefit pension plans		444				444
Changes in fair value of derivative		59				59
Repurchase 942.134 Class A Common Shares in 2013 and 988,990 Class A Common Shares in 2014		(17,828)	(10)	(10,469)	(7,349)
Compensation plans: 2,414,889 net shares issued in 2013 and 1,065,619 in 2014	[1]	6,395	11	6,384
Balance at Mar. 31, 2014		$ 536,195	$ 561	$ 505,158	$ 108,932	$ (80,420)	$ 1,964

[1] * Net of tax payments related to shares withheld for vested stock and RSUs of $3,835 in 2014 and $5,906 in 2013.