CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock Issued	Common Stock Treasury	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Balances at Dec. 31, 2009	$ 1,509,834	$ 139,234	$ (735,016)	$ 137,746	$ 2,133,297	$ (201,684)	$ 36,257
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	12,459				6,754		5,705
Cash dividends declared:
Common @ $0.82 per share, $0.82 per share, and $0.82 per share in 2010, 2011, and 2012, respectively	(66,131)				(66,131)
Noncontrolling interests	(5,850)						(5,850)
Translation adjustments, net of deferred income taxes of $7,612, $2,504, and $(5,436) in 2010, 2011, and 2012, respectively	(6,633)					(6,430)	(203)
Cash flow hedging instrument adjustments, net of deferred income taxes of $347, $(2,101), and $567 in 2010, 2011, and 2012, respectively	(700)					(700)
Purchase of subsidiary shares from noncontrolling interests	(1,159)			(1,003)			(156)
Contributions from noncontrolling interests	698						698
Pension liability adjustments, net of deferred income taxes of $(9,727), $19,143, and $7,572 in 2010, 2011, and 2012, respectively	22,872					22,872
Marketable securities unrealized gain (loss), net of deferred income taxes of $(7), $7, and $(3) in 2010, 2011 and 2012, respectively	10					10
Stock options exercised, net 91,485 shares, 157,058 shares, and 38,900 shares in 2010, 2011, and 2012, respectively	754	144	(836)	1,446
Vesting of restricted stock units and other stock grants, net 69,515 shares, 92,630 shares and 68,558 shares in 2010, 2011 and 2012, respectively	(1,306)	136	(1,254)	(188)
Amortization of unearned stock-based compensation, net of forfeitures	3,297			3,297
Balances at Dec. 31, 2010	1,468,145	139,514	(737,106)	141,298	2,073,920	(185,932)	36,451
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(9,556)				(11,510)		1,954
Cash dividends declared:
Common @ $0.82 per share, $0.82 per share, and $0.82 per share in 2010, 2011, and 2012, respectively	(66,176)				(66,176)
Noncontrolling interests	(4,171)						(4,171)
Translation adjustments, net of deferred income taxes of $7,612, $2,504, and $(5,436) in 2010, 2011, and 2012, respectively	(60,575)					(60,354)	(221)
Cash flow hedging instrument adjustments, net of deferred income taxes of $347, $(2,101), and $567 in 2010, 2011, and 2012, respectively	5,933					5,933
Contributions from noncontrolling interests	9,526						9,526
Pension liability adjustments, net of deferred income taxes of $(9,727), $19,143, and $7,572 in 2010, 2011, and 2012, respectively	(123,827)					(123,827)
Marketable securities unrealized gain (loss), net of deferred income taxes of $(7), $7, and $(3) in 2010, 2011 and 2012, respectively	(11)					(11)
Stock options exercised, net 91,485 shares, 157,058 shares, and 38,900 shares in 2010, 2011, and 2012, respectively	2,319	249	(840)	2,910
Vesting of restricted stock units and other stock grants, net 69,515 shares, 92,630 shares and 68,558 shares in 2010, 2011 and 2012, respectively	226	151	(910)	985
Treasury shares repurchased, 286,577 shares in 2011	(5,788)		(5,788)
Amortization of unearned stock-based compensation, net of forfeitures	3,873			3,873
Balances at Dec. 31, 2011	1,219,918	139,914	(744,644)	149,066	1,996,234	(364,191)	43,539
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(254,101)				(254,612)		511
Cash dividends declared:
Common @ $0.82 per share, $0.82 per share, and $0.82 per share in 2010, 2011, and 2012, respectively	(66,132)				(66,132)
Noncontrolling interests	(2,605)						(2,605)
Translation adjustments, net of deferred income taxes of $7,612, $2,504, and $(5,436) in 2010, 2011, and 2012, respectively	11,434					10,995	439
Cash flow hedging instrument adjustments, net of deferred income taxes of $347, $(2,101), and $567 in 2010, 2011, and 2012, respectively	(4,333)					(4,333)
Contributions from noncontrolling interests	8,602						8,602
Sale of investment in consolidated subsidiary	(704)						(704)
Pension liability adjustments, net of deferred income taxes of $(9,727), $19,143, and $7,572 in 2010, 2011, and 2012, respectively	(53,645)					(53,645)
Marketable securities unrealized gain (loss), net of deferred income taxes of $(7), $7, and $(3) in 2010, 2011 and 2012, respectively	6					6
Stock options exercised, net 91,485 shares, 157,058 shares, and 38,900 shares in 2010, 2011, and 2012, respectively	710	49		661
Vesting of restricted stock units and other stock grants, net 69,515 shares, 92,630 shares and 68,558 shares in 2010, 2011 and 2012, respectively	515	117	(561)	959
Amortization of unearned stock-based compensation, net of forfeitures	1,959			1,959
Balances at Dec. 31, 2012	$ 861,624	$ 140,080	$ (745,205)	$ 152,645	$ 1,675,490	$ (411,168)	$ 49,782