CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock Issued	Treasury Stock [Member]	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
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 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 2011, 2012, and 2013, respectively	(66,176)				(66,176)
Noncontrolling interests	(4,171)						(4,171)
Translation adjustments, net of deferred income taxes of $2,504, $(5,436) and $(5,924) in 2011, 2012 and 2013 respectively	(60,575)					(60,354)	(221)
Cash flow hedging instrument adjustments, net of deferred income taxes of $(2,101), $567 and $(1,410) in 2011, 2012 and 2013, respectively	5,933					5,933
Contributions from noncontrolling interests	9,526						9,526
Pension liability adjustments, net of deferred income taxes of $19,143, $7,572 and $(11,095) in 2011, 2012 and 2013, respectively	(123,827)					(123,827)
Marketable securities unrealized gain (loss), net of deferred income taxes of $7, $(3) and $(18) in 2011, 2012 and 2013 respectively	(11)					(11)
Stock options exercised, net 157,058 shares, 38,900 shares and 20,000 shares in 2011, 2012 and 2013, respectively	2,319	249	(840)	2,910
Vesting of restricted stock units and other stock grants, net 92,630 shares, 68,558 shares and 74,297 shares in 2011, 2012 and 2013, 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 loss	(254,101)				(254,612)		511
Cash dividends declared:
Common @ $0.82 per share, $0.82 per share, and $0.82 per share in 2011, 2012, and 2013, respectively	(66,132)				(66,132)
Noncontrolling interests	(2,605)						(2,605)
Translation adjustments, net of deferred income taxes of $2,504, $(5,436) and $(5,924) in 2011, 2012 and 2013 respectively	11,434					10,995	439
Cash flow hedging instrument adjustments, net of deferred income taxes of $(2,101), $567 and $(1,410) in 2011, 2012 and 2013, 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 $19,143, $7,572 and $(11,095) in 2011, 2012 and 2013, respectively	(53,645)					(53,645)
Marketable securities unrealized gain (loss), net of deferred income taxes of $7, $(3) and $(18) in 2011, 2012 and 2013 respectively	6					6
Stock options exercised, net 157,058 shares, 38,900 shares and 20,000 shares in 2011, 2012 and 2013, respectively	710	49		661
Vesting of restricted stock units and other stock grants, net 92,630 shares, 68,558 shares and 74,297 shares in 2011, 2012 and 2013, 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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(218,188)				(227,941)		9,753
Cash dividends declared:
Common @ $0.82 per share, $0.82 per share, and $0.82 per share in 2011, 2012, and 2013, respectively	(66,228)				(66,228)
Noncontrolling interests	(4,764)						(4,764)
Translation adjustments, net of deferred income taxes of $2,504, $(5,436) and $(5,924) in 2011, 2012 and 2013 respectively	(55,827)					(56,198)	371
Cash flow hedging instrument adjustments, net of deferred income taxes of $(2,101), $567 and $(1,410) in 2011, 2012 and 2013, respectively	1,047					1,116	(69)
Contributions from noncontrolling interests	4,825						4,825
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	(185)			(292)			107
Sale of investment in consolidated subsidiary	(15,909)			1,003			(16,912)
Pension liability adjustments, net of deferred income taxes of $19,143, $7,572 and $(11,095) in 2011, 2012 and 2013, respectively	95,604					95,604
Marketable securities unrealized gain (loss), net of deferred income taxes of $7, $(3) and $(18) in 2011, 2012 and 2013 respectively	31					31
Stock options exercised, net 157,058 shares, 38,900 shares and 20,000 shares in 2011, 2012 and 2013, respectively	400	25		375
Vesting of restricted stock units and other stock grants, net 92,630 shares, 68,558 shares and 74,297 shares in 2011, 2012 and 2013, respectively	1,185	143	(1,032)	2,074
Amortization of unearned stock-based compensation, net of forfeitures	3,220			3,220
Balances at Dec. 31, 2013	$ 606,835	$ 140,248	$ (746,237)	$ 159,025	$ 1,381,321	$ (370,615)	$ 43,093